JP2017078329A - Suspended ceiling reinforcement structure and construction method for suspended ceiling reinforcement structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspended ceiling reinforcement structure and construction method for the suspended ceiling reinforcement structure that eliminate limitation of an installation position of a reinforcement brace and enable effective and efficient earthquake-resistance strengthening and earthquake-resistance repair for a suspended ceiling structure.SOLUTION: There is provided a suspended ceiling reinforcement structure C for reinforcing a suspended ceiling structure B comprising: a ceiling base 7 that is constituted by main steel materials provided in parallel at predetermined intervals in one horizontal direction and is suspended and supported on an upper structure 3 of a building skeleton; and a ceiling material 6 that is attached to a main steel material of the ceiling base 7 to form a ceiling surface. The suspended ceiling reinforcement structure comprises: a reinforcement brace 15; a brace upper part fixture 16 for connecting the top end of the reinforcement brace 15 to the upper structure 3; a brace lower part fixture 17 for connecting the bottom end of the reinforcement brace 15 to the ceiling material 6; and a brace lower part stress transmission member 18 that is interposed between the brace lower part fixture 17 and the ceiling material 6 while connecting with the brace lower part fixture 17 and the ceiling material 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a suspended ceiling reinforcing structure and a method for constructing a suspended ceiling reinforcing structure.

  Conventionally, suspended ceilings are frequently used as ceilings of buildings such as schools, hospitals, production facilities, gymnasiums, pools, airport terminal buildings, office buildings, theaters, cinecones, etc. (see, for example, Patent Document 1 and Patent Document 2). . As shown in FIG. 14, the suspended ceiling A has a plurality of field edges (main steel members) 1 arranged in parallel at a predetermined interval in one horizontal direction T1, and is perpendicular to the field edge 1 and is horizontal. A plurality of field receivers 2 that are arranged in parallel in the other direction T2 with a predetermined interval and are integrally connected to a plurality of field edges 1, a lower end is connected to the field receiver 2, and an upper end is an upper floor A plurality of suspension bolts 4 fixedly attached to the upper structure 3 such as a flooring material and a grid-like ceiling base 7 composed of a field edge 1 and a field edge receiver 2 are screwed together and attached to the ceiling. Some have a ceiling panel (ceiling material) 6 such as a gypsum board that forms a surface (ceiling part 5).

  Further, as shown in FIG. 15, a predetermined interval is provided in a horizontal direction T1 for a suspended ceiling A in which a heavy equipment such as a fan filter unit needs to be installed on the ceiling portion 5 as in a clean room. A plurality of T bars (inverted T-shaped main steel material) 8 extending in the other direction T2 orthogonal to one direction T1 and the upper end are fixed to the upper structure 3 and the lower end side is connected to the T bar 8. And a plurality of suspension bolts 4 and a ceiling panel 6 that is screwed to a ceiling base 7 made of T-bar 8 or the like and integrally attached to form a ceiling surface (ceiling portion 5). There are also things.

  Here, the suspended ceiling A formed by supporting the ceiling edge 7 and the ceiling panel 6 such as the T-bar 8 and the ceiling panel 6 with suspension bolts 4 is horizontal because of its structure. It is easy to roll by force. Then, when the earthquake sways, the end portion 5a of the ceiling portion 5 may collide with a building component (building frame) 9 such as a wall, a column, or a beam, and the ceiling panel 6 may be damaged or fallen off. there were.

  For this reason, conventionally, the upper end is connected to the suspension structure side of the upper structure 3 and the suspension bolt 4 and the lower end is connected to the ceiling base 7 such as the suspension bolt 4, the field edge 1, the field edge receiver 2, and the T-bar 8. The reinforcing brace (brace material) 10 is obliquely connected to suppress the rolling of the ceiling portion 5 including the ceiling base 7 and the ceiling panel 6 during an earthquake (see FIG. 14).

JP 2008-121371 A JP 2005-350950 A

  On the other hand, in the conventional suspended ceiling A, the upper end and the lower end of the reinforcement brace 10 are connected to the suspension bolt 4 and the ceiling foundation 7, and horizontal force is applied by the suspension bolt 4, the ceiling foundation 7 and the reinforcement brace 10. I try to pay. In this case, the installation position of the reinforcing brace 10 is restricted depending on the position and shape of the suspension bolt 4 and the ceiling base 7.

  Further, when further improving the yield strength and rigidity of the entire suspended ceiling structure with respect to the force in the horizontal direction, the installation position of the reinforcing brace 10 is restricted, so that the suspension bolt 4 that connects the lower end of the reinforcing brace 10 or Since a reinforcing material is separately provided at the site of the ceiling base 7, the weight applied to the suspension bolt 4 and the ceiling base 7 is increased, resulting in an increase in the horizontal force acting during an earthquake.

  In view of the above circumstances, the present invention eliminates the restriction on the installation position of the reinforcing brace, and implements a suspended ceiling reinforcing structure and a suspended ceiling reinforcing structure that enables effective and efficient earthquake-resistant reinforcement and earthquake-resistant repair of a suspended ceiling structure. It aims to provide a method.

  In order to achieve the above object, the present invention provides the following means.

  The suspended ceiling reinforcing structure of the present invention includes a main base material arranged side by side in a horizontal direction at a predetermined interval, and is suspended and supported by an upper structure of a building frame, and the main base material of the ceiling base is provided. A suspended ceiling reinforcing structure for reinforcing a suspended ceiling structure comprising a ceiling material attached to a steel material to form a ceiling surface, the reinforcing brace and an upper end portion of the reinforcing brace for connecting to the upper structure A brace upper fixture and a brace lower fixture for connecting a lower end of the reinforcing brace to the ceiling member, and the brace lower fixture and the ceiling while being connected to the brace lower fixture and the ceiling member It is characterized by comprising a brace lower stress transmission member interposed between the materials.

  Further, in the suspended ceiling reinforcing structure of the present invention, the brace lower fixture is disposed on the ceiling material, connected to a brace connecting portion connecting a lower end portion of the reinforcing brace and a lower end of the brace connecting portion. And a ceiling material connecting portion that is fixed to the ceiling material by driving a screw from the ceiling surface side of the ceiling material, and is formed with a length larger than the interval in the one direction of the adjacent main steel materials In addition, it is desirable to form a ceiling base fitting recess that is recessed upward from the lower surface and that can be fitted with the main steel material of the ceiling base.

  The suspended ceiling reinforcing structure of the present invention includes a main base material arranged side by side in a horizontal direction at a predetermined interval, and is suspended and supported by an upper structure of a building frame, and the main base material of the ceiling base is provided. A suspended ceiling reinforcing structure for reinforcing a suspended ceiling structure comprising a ceiling material attached to a steel material to form a ceiling surface, the reinforcing brace and an upper end portion of the reinforcing brace for connecting to the upper structure A brace upper fixture, a brace lower fixture for connecting a lower end portion of the reinforcing brace to the ceiling material, and an intermediate between the brace lower fixture and the ceiling material while being connected to the brace lower fixture A brace lower stress transmitting member, and the brace lower fixture is connected to the brace connecting portion connecting the lower end of the reinforcing brace and the lower end of the brace connecting portion, A connecting portion fixed to the brace lower stress transmission member by screwing together, and having a length larger than the one-way interval between the adjacent main steel materials, and upward from the lower surface The ceiling base material is provided with a ceiling base mating recess capable of fitting the main steel material of the ceiling base, and the ceiling material is fixed to the main steel material of the ceiling base by screwing from the ceiling surface side. The brace lower stress transmission member is interposed between the brace lower fixture and the ceiling material.

  Further, in the suspended ceiling reinforcing structure of the present invention, a reinforcing steel material is disposed on the connecting portion of the brace lower fixture, and the reinforcing steel material is connected to the brace lower fixture and the brace lower stress transmission member. It is desirable that the screws are fixed to each other.

  The method for constructing a suspended ceiling reinforcing structure according to the present invention is any one of the methods for constructing the suspended ceiling reinforcing structure described above, wherein a screw is driven into the connecting portion of the brace lower fixture from below to transmit the stress below the brace. After fixing the members integrally, the ceiling material is disposed so as to sandwich the brace lower stress transmission member between the brace lower fixture and the connecting portion, and a screw is driven in from the ceiling surface side so that the ceiling material is inserted. Is integrally fixed to the main steel material of the ceiling base.

  According to the suspended ceiling reinforcing structure and the method for constructing the suspended ceiling reinforcing structure of the present invention, it is possible to eliminate the restriction of the installation position of the reinforcing brace, and to effectively and efficiently retrofit and suspend the suspended ceiling structure. At the same time, it is possible to provide excellent seismic performance.

It is a figure which shows the suspended ceiling reinforcement structure which concerns on one Embodiment of this invention. It is a perspective view which shows the brace upper fixture of the suspended ceiling reinforcement structure which concerns on one Embodiment of this invention. It is a disassembled perspective view which shows the brace upper fixture of the suspended ceiling reinforcement structure which concerns on one Embodiment of this invention. It is a figure which shows the condition of the operation | work which connects the brace upper fixture of the suspended ceiling reinforcement structure which concerns on one Embodiment of this invention to the superstructure of a building. It is a figure which shows the condition of the operation | work which connects the brace upper fixture of the suspended ceiling reinforcement structure which concerns on one Embodiment of this invention to the superstructure of a building. It is a perspective view which shows the brace upper fixture of the suspended ceiling reinforcement structure which concerns on one Embodiment of this invention. It is a perspective view which shows the brace upper fixture of the suspended ceiling reinforcement structure which concerns on one Embodiment of this invention. It is a perspective view which shows the brace upper fixture of the suspended ceiling reinforcement structure which concerns on one Embodiment of this invention. It is a figure which shows the brace lower fixture of the suspended ceiling reinforcement structure which concerns on one Embodiment of this invention, (a) is a front view, (b) is a rear view, (c) is a side view. It is a top view which shows the suspended ceiling structure and suspended ceiling reinforcement structure which concern on one Embodiment of this invention. It is a figure which shows the experimental apparatus performed using the suspended ceiling structure which concerns on one Embodiment of this invention, (a) is a top view, (b) is the X1-X1 arrow directional view of (a), (c). Is a view taken along line X2-X2 in FIG. It is a figure which shows the experimental result (Test I: Field edge direction force) performed using the suspended ceiling structure which concerns on one Embodiment of this invention. It is a figure which shows the example of a change of the suspended ceiling reinforcement structure which concerns on one Embodiment of this invention. It is a perspective view which shows a suspended ceiling structure. It is a perspective view which shows a suspended ceiling structure.

  Hereinafter, a suspended ceiling reinforcing structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 13 (FIGS. 14 and 15).

  Here, in the present embodiment, for example, a suspension ceiling used as a ceiling of a building such as a school, a hospital, a production facility, a gymnasium, a pool, an airport terminal building, an office building, a theater, or a cine-container is installed for earthquake-proof reinforcement and earthquake-proof repair The present invention relates to a ceiling reinforcement structure.

  First, as shown in FIG. 14, the suspended ceiling (suspended ceiling structure) B of the present embodiment has a plurality of field edges (main steel members) 1 arranged in parallel at a predetermined interval in one horizontal direction T1, and A plurality of field receivers 2 that are orthogonal to the field edge 1 and arranged in parallel in the other horizontal direction T2 with a predetermined interval and are integrally connected to the plurality of field edges 1, and a lower edge of the field edge receiver 2 To the upper structure 3 such as a floor material on the upper floor, and to a grid-like ceiling base 7 composed of a field edge 1 and a field edge receiver 2 And a ceiling panel (ceiling material) 6 that forms a ceiling surface (ceiling part 5).

  In addition, the ceiling ceiling 7 of the suspended ceiling B is composed of a field edge 1 and a field edge receiver 2, that is, a steel material assembled in a lattice shape.

  The suspension bolt 4 is provided by connecting the lower end side to the ceiling base 7 via a suspension member connecting bracket, and supports the ceiling base 7 in a suspended manner.

  Further, for example, a lightweight ceiling panel 6 is fixed to the lower surface of the ceiling base 7 by passing a screw through the ceiling panel 6 and the ceiling base 7 from below. Thus, the ceiling surface is formed by attaching the ceiling panel 6 to the ceiling base 7.

  On the other hand, in the suspended ceiling B of the present embodiment, as shown in FIG. 1, a suspended ceiling reinforcing structure for suppressing a ceiling inertia force (horizontal force) when an earthquake occurs and suppressing a roll of the ceiling portion 5. C is provided.

  The suspended ceiling reinforcing structure C of the present embodiment includes a reinforcing brace 15, a brace upper fixture 16 for connecting the upper end of the reinforcing brace 15 to the upper structure 3 of the building frame, and a lower end of the reinforcing brace 15 as a ceiling panel. The brace lower fixture 17 for connecting to the brace 6, and the brace lower stress transmission member 18 interposed (provided so as to be sandwiched) between the brace lower fixture 17 and the ceiling panel 6 are configured. Yes.

  That is, the suspended ceiling reinforcing structure C of the present embodiment is configured by connecting the lower end portion of the reinforcing brace 15 to the ceiling panel 6 instead of the hanging bolt 4 and the ceiling base 7 as in the prior art.

  Further, in the suspended ceiling reinforcing structure C of the present embodiment, the reinforcing brace 15 is a shape steel material, and the pair of reinforcing braces 15 is set as one set, and the pair of reinforcing braces 15 is set in one direction T1 and / or others. It is arranged side by side in the direction T2 so as to have a V shape or a letter shape when viewed from the front, and the upper and lower ends of each reinforcing brace 15 are the upper structure of the building with the brace upper fixture 16 and the brace lower fixture 17, respectively. 3 and the ceiling panel 6 (the brace lower stress transmission member 18).

  As shown in FIGS. 2 to 5, the brace upper fixture 16 includes a fixing member 20, a connecting member 21, and a friction member 22. The brace upper fixture 16 is integrally provided on the upper end side of the reinforcing brace 15 and has an outer peripheral surface. A cylindrical connecting rod 15a that is threaded with a male screw is connected to support the reinforcing brace 15.

  The fixing member 20 is a member for fixing the brace upper fixture 16 to the upper structure 3 of the building frame. The fixing member 20 is bonded to the surface of the upper structure 3 and the upper end of the fixing plate 20a. A pair of support plates 20b that are connected and projecting downward and disposed at a predetermined interval are formed.

  Further, the fixing plate 20 a is formed with a mounting hole 20 c for inserting a bolt 23 fixed to the upper structure 3 with an anchor or the like and fixing the fixing member 20 to the surface of the upper structure 3. In addition, the mounting hole 20c is disposed substantially at the center in the width direction of the fixed plate 20a, and is disposed closer to one end than the center in the depth direction of the fixed plate 20a.

  Mounting holes 20d for pivotally supporting the connecting member 21 are formed coaxially in the pair of support plates 20b. The two mounting holes 20d are formed such that one mounting hole 20d has a larger diameter than the other mounting hole 20d. Further, these mounting holes 20d are disposed on the other end side of the center in the depth direction of the support plate 20b.

  The connecting member 21 includes a pair of shaft portions 21a that are pivotally supported by the support plate 20b, and a connecting portion 21b that is positioned between the pair of shaft portions 21a. The pair of shaft portions 21a are attached to the mounting holes 20d of the support plate 20b. Are rotatably supported by the support plate 20b. Further, in the present embodiment, a screw hole 21c for screwing and mounting the connecting rod 15a of the reinforcing brace 15 is formed through the outer peripheral surface of the connecting portion 21b in a direction passing through the axis. Further, the shaft portion 21a is provided with a pin insertion hole 21d for mounting the pin 24 for preventing the connecting member 21 from dropping from the mounting hole 20d of the support plate 20b.

  The friction member 22 is, for example, a resin cylindrical member, and has an inner diameter that is the same as or larger than that of the shaft portion 21a, and an outer diameter that is substantially the same as the inner diameter of the mounting hole 20d. Yes. The friction member 22 is attached to the outer peripheral surface of each shaft portion 21a through the shaft portion 21a through the inner hole. The friction member 22 has one end contacting the inner surface of the support plate 20b or the inner surface of the washer 25, and the other end being a connecting portion 21b (a step portion between the connecting portion 21b and the shaft portion 21a). The support plate 20b and the connecting portion 21b are arranged so as to be pressed with a constant pressing force.

  As a result, the connecting member 21 rotates around the axis O <b> 1 and a friction force can be applied by the friction member 22.

  Further, in the brace upper fixture 16 of the present embodiment, the relative rotation between the connecting member 21 and the fixing member 20 is suppressed by the frictional force applied by the friction member 22. Thereby, the relative angle (rotational position) between the connecting member 21 and the fixing member 20 can be easily adjusted manually, and can be held by the frictional force of the friction member 22.

  In the present invention, the brace upper fixture 16 is not necessarily limited to being configured as described above.

  For example, as shown in FIG. 6, the entire connecting member 21 may be configured as a cylindrical shaft portion 21 a, and washers 25 attached to both ends of the connecting member 21 may be configured as the friction member 22.

  As shown in FIG. 7, the brace upper fixture 16 includes a fixing member 20, a connecting member 21, and a friction member 22, and includes an arm portion 21e and a flat plate portion 21f provided with holes. The connecting member 21 may be configured by inserting the shaft portion 21 a through the hole, and the reinforcing brace 15 may be bolted to the flat plate portion 21 f of the connecting member 21.

  Further, as shown in FIG. 8, the brace upper fixture 16 includes a fixing member 20, a connecting member 21, and a friction member 22, and includes a flat plate portion 21f provided with a hole, and a shaft portion is provided in the hole of the flat plate portion 21f. The connecting member 21 may be configured by inserting 21a, and the reinforcing brace 15 may be bolted to the flat plate portion 21f of the connecting member 21. Moreover, you may make it connect the both ends of the axial part 21a to the fixing member 20 with a volt | bolt and a nut, respectively.

  Next, the brace lower fixture (reinforced brace fixture for suspended ceiling) 17 of the present embodiment is erected with the plate surface facing in the lateral direction as shown in FIGS. 1 and 9, and a pair of reinforcement braces 15. A flat brace connecting portion 27 for connecting the lower end portions of each of the two, and extending from the lower end of the brace connecting portion 27 in a lateral direction perpendicular to the brace connecting portion 27, and screws from the lower surface (ceiling surface) side of the ceiling panel 6. Is formed with a brace lower stress transmission member 18 and a ceiling material connecting portion 28 fixed to the ceiling panel 6.

  Further, the brace lower fixture 17 is formed with a length L that is larger than the interval (span) between adjacent steel materials (the field edge 1 and field edge receiver 2) of the ceiling base 7. And the steel material (the field edge 1 and the field edge receiver 2) of the ceiling base 7 is made to fit in the lower end side of the brace lower fixture 17 from the lower surface, and the brace lower fixture 17 is installed. A ceiling base fitting recess 29 for preventing interference with the ceiling base 7 is provided.

  In the brace lower fixture 17 of the present embodiment, three ceiling foundation fitting recesses 29 for fitting the three adjacent steel materials of the ceiling foundation 7 are provided. As a result, the ceiling material connecting portion 28 includes the first ceiling material connecting portion 28a and the fourth ceiling material connecting portion 28d on both side end portions in the length L direction of the brace lower fixture 17, and the first ceiling material connecting portion 28d on the center side in the length L direction. Two ceiling material connection portions 28b and a third ceiling material connection portion 28c are provided to provide four ceiling material connection portions 28.

  Each ceiling member connecting portion 28 is provided with a stiffening portion 30 that protrudes upward in the orthogonal direction from the tip in the protruding direction and extends in the length L direction.

  Furthermore, the ceiling foundation fitting recess 29 of the present embodiment includes a field edge fitting recess 29a that matches the size and position of the field edge 1, and a T bar fitting recess 29b that matches the size and position of the T bar 8. It is formed with. As a result, when the ceiling base 7 is formed with the field edge 1, the same brace lower fixture 17 can be applied to either case where the ceiling base 7 is formed with the T-bar 8. Is formed.

  In addition, the brace connecting portion 27 is provided with a plurality of holes 27a at predetermined positions for connecting the reinforcing brace 15 using screws or the like. Further, the brace connecting portion 27 specifies an effective stress range of stress generated by the force transmitted from the reinforcing brace 15 and the ceiling panel 6 when the suspended ceiling B receives a horizontal force during an earthquake, and the reinforcing brace 15 A portion having a small stress acting on the brace connecting portion 27 is cut out in accordance with the relative position, the connecting position, and the like, and the shape corresponding to the effective stress range is formed.

  That is, in this embodiment, the notch portion 27b is provided on the upper side on both ends of the length L direction across the portion connecting the reinforcing brace 15, and the brace connecting portion 27 is formed corresponding to the effective stress range. The brace connecting portion 27 and the brace lower mounting member 17 are reduced in weight.

Next, the brace lower stress transmission member 18 of the present embodiment is a plate material such as a galvanized steel plate and is larger than the width (L) and the depth dimension of the brace lower fixture as shown in FIGS. It is formed with width and depth dimensions. In this embodiment, as the brace lower stress transmission member 18, for example, a galvanized steel sheet having a rectangular shape in plan view with a thickness of 0.5 mm (0.27 mm or more) is applied.
FIG. 10 is a plan view showing a suspended ceiling structure B using a square tone (lightweight ceiling material having a number of rectangular through holes) manufactured by Yoshino Gypsum Co., Ltd. as the ceiling panel 6.

  The brace lower stress transmission member 18 is disposed (laid) on the ceiling panel 6 and is interposed between the ceiling panel 6 and the brace lower fixture 17. In the present embodiment, the brace lower stress transmission member 18 is provided so as to be sandwiched between the ceiling base 7 and the ceiling panel 6.

  The brace lower stress transmission member 18 is driven by a screw 19 from the lower surface (ceiling surface) side of the ceiling panel 6, and is integrally connected to the ceiling panel 6 by the screw 19. Further, the brace lower stress transmission member 18 is driven by a screw 19 and a part thereof is integrally connected to the ceiling base 7 together with the ceiling panel 6. The brace lower stress transmission member 18 is connected together with the ceiling panel 6 by driving a screw 19 into the ceiling member connecting portion 28 of the brace lower fixture 17.

  Note that the shape (size, etc.), material, and number of screws 19 of the brace lower stress transmission member 18 are the stress acting between the brace lower stress transmission member 18, the ceiling panel 6, and the reinforcing brace 15 (acting between the ceiling base 7. (Shearing force (assumed / design shearing force)) to be determined.

  When installing the suspended ceiling reinforcing structure C of the present embodiment having the above-described configuration, first, the top end of the reinforcing brace 15 is attached to the screw hole 21c, and the brace upper fixture 16 is attached to the reinforcing brace 15, so that the reinforcing brace 15 And the fixing member 20 are adjusted to a desired angle.

  Next, as shown in FIG. 4, the bolt 23 protruding downward from the upper structure 3 is inserted into the mounting hole 20 c provided in the fixing member 20 while lifting the tip of the reinforcing brace 15. At this time, the operator can perform the insertion work while visually confirming the positional relationship between the bolt 23 and the mounting hole 20c, and can perform this insertion work while staying in a relatively low place.

At the stage where the bolt 23 is inserted into the mounting hole 20c of the fixing member 20, the lower end portion of the reinforcing brace 15 is brought into contact with the ceiling panel 6, the ceiling base 7 and the like so as not to slip, and the posture of the reinforcing brace 15 is stabilized. Then, as shown in FIG. 5, a nut 31 is attached to the end of the long tool, and the nut 31 is attached to a bolt 23 protruding downward from the attachment hole 20c while lifting the tool upward, and the tool is driven to rotate. We conclude by.
In addition, if a long nut is used as the nut 31, workability at the time of mounting can be improved.

  Next, the brace lower stress transmission member 18 is placed at a predetermined position on the ceiling panel 6, and the brace lower fixture 17 is placed at a predetermined position above the brace lower stress transmission member 18.

  At this time, the brace lower stress transmission member 18 may be bonded to the ceiling panel 6 with an adhesive. When the brace lower fixture 17 is provided with the reinforcing brace 15 in one direction T1, the steel material adjacent to the ceiling base 7 (the field edge 1 and the field edge receiver 2) is fitted into the pair of ceiling foundation fitting recesses 29. Support and place in place.

  When the reinforcing brace 15 is disposed in the other direction T <b> 2 along the field edge 1, a dummy material (temporary support member) having substantially the same cross-sectional shape as the field edge 1 is installed on the back surface of the ceiling panel 6. The dummy material is fitted into and supported by the pair of ceiling base mating recesses 29, and the brace lower fixture 17 is installed at a predetermined position.

  Thus, the brace lower fixture 17 can be freely supported in both the one direction T1 and the other direction T2 by simply fitting the ceiling base 7 and the dummy material into the ceiling base fitting recess 29. .

  Moreover, the screw 19 is driven in from the lower surface side (ceiling surface side) of the ceiling panel 6, and the ceiling panel 6 and the brace lower stress transmission member 18 are fixed. Further, the screws 19 are driven into the respective ceiling material connecting portions 28 to fix the brace lower fixture 17, the ceiling panel 6, and the brace lower stress transmission member 18.

  Note that it is preferable to connect the brace lower fixture 17, the ceiling panel 6, and the brace lower stress transmission member 18 by driving four or more screws 19 such as a tex screw into each ceiling material connecting portion 28. Further, it is preferable to fix the ceiling panel 6, the brace lower stress transmission member 18, and the brace lower fixture 17 by driving 18 screws 19 such as board screws.

  Then, as shown in FIG. 1, the lower end portion of the reinforcing brace 15 is lifted, and the position of the lower end portion is adjusted to the position of the brace lower fixture 17 while adjusting the arrangement angle of the reinforcing brace 15. Connect to. At this time, the lower end portion of the reinforcing brace 15 is connected to the brace connecting portion 27 of the brace lower mounting member 17 disposed and supported at a predetermined position using a screw. Of course, it is possible to use bolts instead of screws.

  Thereby, the construction of the suspended ceiling reinforcing structure C of the present embodiment, the earthquake-proof reinforcement of the suspended ceiling B, and the earthquake-proof repair are completed.

  Here, conventionally, when the ceiling panel 6 is screwed to the ceiling base 7 or the like, a washer is used in order to prevent the suspended ceiling from rolling due to an earthquake or the like and causing the head 19 to slip out. For this reason, the washer is exposed on the ceiling surface, and the appearance of the suspended ceiling may be deteriorated.

  On the other hand, in this embodiment, as described above, the plate-like brace lower stress transmission member 18 is laid, and the brace lower fixture 17 is provided on the plate-like brace lower attachment member 17 to be screwed from the lower surface side of the ceiling panel 6. Since the brace lower stress transmission member 18 is interposed when the suspended ceiling B rolls due to an earthquake or the like, the force generated on each screw 19 (force acting on one screw) is reduced and the pulling force is reduced. The yield strength of one screw can be effectively used by converting the shear strength into a shear strength advantageous in terms of yield strength. For this reason, it is possible to suppress the head 19 from slipping without using a washer, and the appearance of the suspended ceiling B can be improved without the washer.

  Next, an experiment conducted to confirm the superiority of the suspended ceiling reinforcing structure C and the suspended ceiling B (ceiling unit) of the present embodiment will be described.

  First, in this experiment, as shown in FIG. 10, t = 12.5 mm gypsum board manufactured by Yoshino Gypsum Co., Ltd. and square tone manufactured by Yoshino Gypsum Co., Ltd. were used as the ceiling material 6. Moreover, the steel plate was used as the brace lower stress transmission member 18 which is a reinforcing material. Then, in order to evaluate the allowable strength and the horizontal rigidity of the entire ceiling, the test was conducted in compliance with the test procedure described in the Ministry of Land, Infrastructure, Transport and Tourism Notification No. 771. In addition, for comparison with the previous test using a gypsum board, the force direction was the edge direction.

  As shown in FIG. 11, the test body of the ceiling unit (suspended ceiling structure B) is a ceiling having a width of 1820 × depth of 3640 mm, and this ceiling is a steel test stand 32 (width of 5.6 m, depth of 3.3 m, height). 3.70 m) It is supported in the vertical direction by the suspension bolt 4 from the PC plate placed on top.

  The force applied to the test body was applied by the hydraulic jack 33 and the side surface of the ceiling material 6 was pressurized through an H-150 × 150 steel material installed separately so as not to affect the weight. The upper end of the reinforcing brace (oblique member) 15 is on the PC plate placed on the steel frame 32, and the lower end is on the ceiling member 6. The dedicated hardware shown in the above embodiment (the brace upper fixture 16, the brace lower attachment) The tool 17 and the brace lower stress transmission member 18) were used for fixing.

  The amount of deformation of the ceiling was measured at the two end portions of the test body in the vicinity of the lower end portion of the reinforcing brace 15 with respect to the relative displacement between the floor surface of the test site and the ceiling surface. In addition, the test body is assembled by the ceiling material 6, the suspension bolts 4 and a set of reinforcing braces 15 according to the actual structure method, and restrains deformation in the direction perpendicular to the force direction as necessary. Reinforcing brace 15 or the like is attached.

The specifications of the test specimen are as shown in Table 1.
Since the allowable yield strength does not depend on the strength of the ceiling material or the like as long as the buckling of the brace precedes, the test body (Test I) was set with a suspension length of 3000 mm for the purpose of confirming the minimum rigidity.

  Moreover, the test shall be applied in the horizontal direction and was performed according to the following procedure.

1) Implementation of repeated positive / negative force test Repeated positive and negative at least three times at ± 2.0 kN, ± 4.0 kN, and ± 6.0 kN on a jig that is attached to a part where the force is applied evenly among the ceiling surface components. Apply power.

2) Execution of the maximum load test After the positive / negative repeated force test, the load is continued stepwise until the load Q _max at the time of fracture is obtained.

Based on the load-displacement curve, a straight line connecting a load-displacement value of about 20% of the load Q _max at the time of failure and the origin is defined as an initial stiffness, and a stiffness line of 1/3 of the initial stiffness in contact with the load-displacement curve; The intersection point of the straight lines of initial stiffness is defined as a load Q _d at the time of damage.

3) Test record items Record the following items in the test results.
Installation angle of reinforcing brace 15, suspension length, specification of reinforcing brace 15, number of screws 19 with ceiling material 6 of reinforcing brace 15, load Q _max at break, load Q _d at break, allowable proof strength Q _a , Maximum displacement at ± 4.0 kN and horizontal stiffness calculation value, deformation or fracture state of each part of the test specimen, load-displacement curve

The horizontal rigidity of the entire ceiling is obtained by a straight line connecting the point and origin corresponding to the maximum displacement Da _{, max} when ± 6.0 kN force is applied, based on the load-displacement curve in the positive / negative repeated force test. Horizontal rigidity: 6.0 / D _{a, max} (kN / mm).

  The test results of Test I (field edge direction force) are shown in FIG.

  As for the breaking state at the maximum load, in the test using the square tone D as the ceiling material 6, the reinforcement brace (oblique member) 15 was buckled.

<Evaluation of allowable yield strength>
It was confirmed that the allowable proof strength Qa is equal to or greater than the design value as the allowable proof strength, and Qa = 4.92 kN> 4.0 kN (the specified value for the maximum horizontal force during an earthquake borne by one set of reinforcing braces 15).

<Evaluation of horizontal rigidity>
The rigidity value in the horizontal direction was 1685 kN / m (test value).
The natural period T _{ceil of the} ceiling can be calculated by the following equation (1). _Here , M _ceil is the ceiling mass, and K _ceil is the horizontal rigidity of one set of diagonal members.

Then, the mass per unit area of the suspended ceiling is 6.5 (ceiling board) +4.0 (ceiling base) +4.0 (ceiling incidental equipment) = if 14.5 kg / ^{m 2,} ceiling natural period _{T ceil} becomes 0.92 seconds, even Tsucho of 3000mm as the most unfavorable for stiffness, the natural period in brace pair to 25 m ² 0. It was confirmed that a “rigid” period band of 1 second or less was obtained.

  From the above experiments, first, it is confirmed that in the suspended ceiling structure B of the present embodiment, the allowable strength of the brace lower end joining portion (suspended ceiling reinforcing structure C of the present embodiment) is very excellent. It was confirmed that there was no problem in the allowable yield strength in the range of 0.4 to 3 m.

In addition, as for the rigidity of the ceiling, even if a soft ceiling material 6 such as square tone D is used, the mass is small, so that the natural period is 0.1 seconds by setting one set of braces to a ceiling suspended length of 3 m and 25 m ^2. The following “rigid” periodic bands were confirmed.

  Therefore, in the suspended ceiling reinforcement structure C of the present embodiment, first, the lower end portion is not the main steel material (T bar 8 or the field edge 1) of the ceiling base 7 but the brace lower fixture 17 is used as in the conventional case. A reinforcing brace 15 can be installed in connection with the panel 6. Thereby, the reinforcing brace 15 can be provided without being restricted by the position of the ceiling base 7 and the reinforcing brace 15 can be provided without being restricted by the strength of the ceiling base 7.

  And since the reinforcement brace 15 can be provided, without receiving restrictions, such as a position of the ceiling foundation | substrate 7, it becomes possible to raise the freedom degree of the earthquake-proof reinforcement by the reinforcement brace 15, and an earthquake-proof repair significantly.

  In addition, since the reinforcing brace 15 can be provided without being restricted by the strength of the ceiling base 7, it is possible to install a reinforcing brace having a larger size and higher strength than the conventional one. That is, for example, in the past, a C-40 × 20 × 10 × 1.6 size steel is often used as a reinforcing brace, but in the suspended ceiling reinforcing structure C of the present embodiment, when the suspended length is less than 1000 mm C-40 × 20 × 10 × 1.6 is used, C-65 × 30 × 10 × 1.6 when the suspended length is less than 1000 to 2000 mm, and C when the suspended length is 2000 to 3000 mm or less. It becomes possible to use a large-sized section steel such as −75 × 45 × 15 × 1.6 as the reinforcing brace 15. Therefore, also from this point, it becomes possible to greatly increase the degree of freedom of seismic reinforcement and seismic retrofit by reinforcing braces.

  Furthermore, the brace lower fixture 17 is placed at an arbitrary position on the ceiling panel 6, and is fastened with screws from the lower side of the ceiling surface so that the ceiling material connecting portion 28 is fixed to the ceiling panel 6. The fixture 17 can be installed integrally with the ceiling panel 6. Thereby, compared with the past, the workability which installs the reinforcement brace 15 can be improved significantly.

  In addition, the brace lower fixture 17 is formed with a length L larger than the interval between adjacent main steel materials, that is, by being formed with a length L larger than one span of the ceiling base 7. A horizontal force acting on the ceiling portion 5 including the ceiling base 7 and the ceiling panel 6 during an earthquake can be effectively transmitted to the reinforcing brace 15.

Further, by fitting the main steel material of the ceiling foundation 7 into the ceiling foundation fitting recess 29, the brace lower fixture 17 formed with a length L larger than one span is supported on the ceiling foundation 7 and is easily horizontal. It can be installed with the length L direction facing one direction T1. Further, a dummy material such as a piece of main steel material is placed on the ceiling panel 6 along one direction T1, and the dummy material is fitted to the ceiling base fitting recess 29 to support the brace lower fixture 17; It can be easily installed with the length L direction in the other direction T2 orthogonal to the horizontal one direction T1.
Thereby, even when installing the reinforcement brace 15 along one direction T1, even when installing along the other direction T2, it can respond easily.

  Furthermore, the number of members and types can be reduced, quality control can be facilitated, and the cost required for reinforcing the suspended ceiling B can be reduced.

  Furthermore, in the suspended ceiling reinforcing structure C of the present embodiment, the brace lower fixture 17 and the ceiling panel 6 are connected to each other by using screws 19 or an adhesive while being connected between the brace lower fixture 17 and the ceiling panel 6. By interposing the brace lower stress transmission member 18, the stress generated in the reinforcing brace 15 can be transmitted and dispersed over the ceiling panel 6 by the brace lower stress transmission member 18.

  Accordingly, by providing the suspended ceiling reinforcing structure C including the brace lower stress transmission member 18, even if the ceiling material 6 is soft (with respect to any ceiling material 6), the natural period is 0.1 seconds or less. It is possible to increase the rigidity of the suspended ceiling B, and it is possible to provide extremely excellent seismic performance. That is, highly reliable seismic reinforcement and seismic retrofit can be realized.

In addition, when the brace lower stress transmission member 18 is provided and connected to the ceiling panel 6 using screws 19, the stress generated in the reinforcing brace 15 by the brace lower stress transmission member 18 is transmitted to the ceiling panel 6 over a wide area. Since it can be dispersed, the force acting on each screw 19 can be reduced, and since it acts as a shearing force, the bonding strength of the screw 19 can be used effectively.
Accordingly, it is possible to suppress the head 19 from slipping without using a washer, and it is possible to improve the appearance of the suspended ceiling B because there is no washer.

  Therefore, according to the suspended ceiling reinforcing structure C (suspended ceiling structure B) of the present embodiment, the installation position of the reinforcing brace 15 is removed, and the suspended ceiling structure B is effectively and efficiently reinforced and improved. As well as providing excellent seismic performance.

  Here, as described above, the suspended ceiling reinforcing structure C (suspended ceiling structure B) of the present embodiment includes the brace lower stress transmission member 18 and is connected to the ceiling panel 6 using the screws 19. The stress generated in the reinforcing brace 15 by the brace lower stress transmitting member 18 can be transmitted and distributed over a wide range of the ceiling panel 6, and the proof stress of the screws 19 per one can be used effectively. Accordingly, it is possible to suppress the head 19 from slipping without using a washer, and it is possible to improve the appearance of the suspended ceiling B because there is no washer.

  On the other hand, when connecting the brace lower stress transmission member 18 (and the brace lower fixture 17 (ceiling material connecting portion 28)) to the ceiling panel 6 using the screws 19, the screws 19 are connected from below the ceiling panel 6. Since it is driven in, the ceiling panel 6 becomes a blind, and workability / workability may be deteriorated.

  Moreover, when using things other than the lightweight ceiling panel 6 shown in FIG. 10, it is desirable to set it as the joining structure which can ensure larger allowable yield strength and high rigidity.

  In response to such a problem, as shown in FIG. 13, the brace lower stress transmission member 18 and the brace lower mounting member 17 (connecting portion 28) are directly screwed with a lance touch screw or the like to sandwich the brace lower stress transmission member 18. The ceiling panel 6 thus arranged may be screwed separately to a ceiling base 7 (such as the field edge 1 or the T bar 8) (the method for constructing the suspended ceiling reinforcing structure according to the present invention). Thereby, an operator can connect to the brace lower stress transmission member 18 while observing the connection part 28 of the brace lower fixture 17, and workability / workability can be improved more than this embodiment.

  Further, in the joint structure in which the brace lower stress transmission member 18 (and the brace lower fixture 17) and the ceiling panel 6 are connected by screws 19, the position and number of screws 19 affect the proof strength and rigidity of the entire suspended ceiling structure B. . For this reason, a reinforcing steel material 34 such as a reinforcing field edge is disposed on the connection portion 28 of the brace lower fixture 17, and the brace lower stress transmission member 18 and the connection portion 28 of the brace lower fixture 17 are directly screwed together. The reinforcing steel material 34 may be connected to the brace lower stress transmission member 18 and the brace lower fixture 17. By providing the reinforcing steel material 34 in this way, it is possible to construct a structure in which the suspended ceiling reinforcing structure C (ceiling plate joint) is not broken up to the maximum breaking load of the brace lower fixture 17. Thereby, it becomes possible to ensure a larger allowable yield strength and higher rigidity than in the present embodiment.

  As mentioned above, although one embodiment of the suspended ceiling reinforcement structure concerning the present invention was described, the present invention is not limited to the above-mentioned one embodiment, and can be suitably changed in the range which does not deviate from the meaning.

  For example, the ceiling foundation according to the present invention may be configured to include a plurality of T bars 8 (main steel material) or may include a field edge 1 (main steel material) and a field edge receiver 2. That is, even if the structure of the ceiling base 7 is different, it is possible to obtain the same effect as that of the present embodiment by applying the present invention.

  In the present embodiment, the suspension ceiling reinforcing structure C according to the present invention has been described to be seismic strengthened and retrofitted with an existing suspended ceiling. Of course, the suspended ceiling reinforcing structure according to the present invention is It may be installed when installing a suspended ceiling.

  Furthermore, the brace lower stress transmission member according to the present invention is not necessarily formed in a rectangular flat plate shape. Further, it may be an FRP plate or the like, and not necessarily a steel plate.

1 Field edge (main steel)
2 Field Margin 3 Superstructure 4 Suspension bolt (suspending member)
5 Ceiling part 6 Ceiling panel (ceiling material)
7 Ceiling base 8 T bar (main steel)
9 Building components (building frame)
DESCRIPTION OF SYMBOLS 10 Reinforcement brace 15 Reinforcement brace 15a Connecting rod 16 Brace upper fixture 17 Brace lower fixture 18 Brace lower stress transmission member 19 Screw 20 Fixing member 20a Fixing plate 20b Mounting plate 20c Mounting hole 20d Mounting hole 20e Notch 21 Connecting member 21a Shaft Portion 21b connecting portion 21c screw hole 21d pin insertion hole 21e arm portion 21f flat plate portion 22 friction member 23 bolt 24 drop-off prevention pin 25 washer 27 brace connection portion 27a hole 27b notch portion 28 ceiling material connection portion (connection portion)
28a 1st ceiling material connection part 28b 3rd ceiling material connection part 28c 4th ceiling material connection part 28d 2nd ceiling material connection part 29 Ceiling base fitting recessed part 29a Field edge fitting recessed part 29b T bar fitting recessed part 30 Stiffening part 31 Nut 32 Test stand 33 Hydraulic jack 34 Steel for reinforcement A Conventional suspended ceiling (suspended ceiling structure)
B Suspended ceiling (suspended ceiling structure)
C Suspended ceiling reinforcement structure L Length of lower brace fixture O1 Axis T1 One direction T2 Other direction T3 Vertical direction

Claims (5)

A main steel material is arranged in parallel in a horizontal direction with a predetermined interval, and a ceiling base that is suspended and supported by the upper structure of the building frame, and a ceiling surface that is attached to the main steel material of the ceiling base A suspended ceiling reinforcing structure for reinforcing a suspended ceiling structure comprising a ceiling material
A brace, a brace upper fixture for connecting the upper end of the reinforcement brace to the upper structure, and a brace lower fixture for connecting the lower end of the reinforcement brace to the ceiling material;
Suspended ceiling reinforcement structure comprising a brace lower stress transmission member interposed between the brace lower fixture and the ceiling member while being connected to the brace lower fixture and the ceiling member . The suspended ceiling reinforcing structure according to claim 1,
The brace lower fitting is connected to a brace connecting portion connecting a lower end portion of the reinforcing brace and a lower end of the brace connecting portion, and is disposed on the ceiling material and is screwed from the ceiling surface side of the ceiling material. A ceiling material connecting portion fixed to the ceiling material by driving
In addition, the ceiling base mating is formed with a length larger than the interval in the one direction of the adjacent main steel materials, and is recessed upward from the lower surface so that the main steel materials of the ceiling base can be fitted. A suspended ceiling reinforcing structure characterized by being provided with a recess. A main steel material is arranged in parallel in a horizontal direction with a predetermined interval, and a ceiling base that is suspended and supported by the upper structure of the building frame, and a ceiling surface that is attached to the main steel material of the ceiling base A suspended ceiling reinforcing structure for reinforcing a suspended ceiling structure comprising a ceiling material
Reinforcement brace, brace upper attachment for connecting the upper end of the reinforcement brace to the upper structure, brace lower attachment for connecting the lower end of the reinforcement brace to the ceiling material, and brace lower attachment While comprising a brace lower stress transmission member interposed between the brace lower fixture and the ceiling material while being connected to a tool,
The brace lower fixture includes a brace connecting portion that connects a lower end portion of the reinforcing brace, and a connecting portion that is connected to the lower end of the brace connecting portion and is screwed to the brace lower stress transmission member to be integrally fixed. Prepared,
In addition, the ceiling base mating is formed with a length larger than the interval in the one direction of the adjacent main steel materials, and is recessed upward from the lower surface so that the main steel materials of the ceiling base can be fitted. Formed with a recess,
The ceiling material is fixed to the main steel material of the ceiling base by screwing from the ceiling surface side, and the brace lower stress transmission member is interposed between the brace lower fixture and the ceiling material. A suspended ceiling reinforcement structure characterized by that. In the suspended ceiling reinforcement structure according to claim 3,
Reinforcing steel material is disposed on the connection portion of the lower brace fixture, and the reinforcing steel material is screwed to the brace lower stress transmission member together with the connection portion of the lower brace fixture and fixed integrally. Suspended ceiling reinforcement structure characterized by It is a construction method of the suspended ceiling reinforcement structure according to claim 3 or claim 4,
The brace lower stress transmitting member is fixed to the connecting portion of the brace lower fixture by screwing a screw into the connecting portion of the brace lower fixture from below to fix the brace lower stress transmitting member integrally. A method for constructing a suspended ceiling reinforcing structure, wherein the ceiling material is arranged so as to be sandwiched, and a screw is driven in from the ceiling surface side so that the ceiling material is integrally fixed to a main steel material of the ceiling base.

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