JP2008274546A - Suspended ceiling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple and inexpensive suspended ceiling which prevents a member constituting the ceiling from being damaged, by inhibiting the ceiling from swinging during earthquakes. <P>SOLUTION: A diagonal member 20 is provided to transfer an inertial force, on the ceiling due to a disturbance, to a structural skeleton 24; and the diagonal member 20 and a supporting beam 14 for supporting the ceiling are connected together by a connecting means 42. The connecting means 42 is provided with holding members 46 and 48, and an energy absorbing means 50. The inertial force on the ceiling due to the disturbance is transferred to the supporting beam 14, the energy absorbing means 50, the holding members 46 and 48, the diagonal member 20 and the structural skeleton 24 in this order, and concentrated on the connecting means 42, so as to make the supporting beam 14 and the holding members 46 and 48 relatively displaced in a horizontal direction. Vibrational energy, which brings about this relative displacement, is absorbed by the energy absorbing means 50. Thus, the response displacement and response acceleration (the inertial force) of the ceiling, which are caused by the disturbance, can be reduced to prevent the member constituting the ceiling from being damaged. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a suspended ceiling having a vibration damping function.

  Generally, a system ceiling capable of shortening the construction period and ensuring quality is used for the ceiling of a building.

  As shown in the system ceiling 200 of FIG. 13, the normal system ceiling is composed of a main T bar 202, a cross T bar 204, a grandchild T bar 206, a suspension bolt 208, a brace material 210, and a ceiling plate 212.

  The suspension bolt 208 is suspended from the upper structural casing 214. A main T bar 202 is attached to the lower end of the suspension bolt 208 by a suspension bolt hanger 216.

  As shown in FIGS. 14 and 15, the suspension bolt hanger 216 sandwiches the main T-bar 202 by opposing plate members 222 and 224 made of aluminum. As a result, a frictional force is generated between the plate member 222 and the main T bar 202 and between the plate member 224 and the main T bar 202 to hold the main T bar 202.

  The force for sandwiching the main T-bar 202 is such that a bolt 226 that is passed through through holes formed in the plate members 222 and 224 is screwed into the nut 232 at a position above the upper end of the main T-bar 202, and the bolt 226 is Give by tightening.

  The upper part 220 of the main T-bar 202 is hollow processed, and the outer thickness thereof is thicker than that of the intermediate part 252. Further, the plate members 222 and 224 have a shape that substantially follows the outer shape of the main T bar 202. Accordingly, when the bolt 226 is tightened, the main T bar 202 is securely held by the suspension bolt hanger 216.

  The plate member 224 extends longer than the plate member 222, and the upper portion of the plate member 224 is bent so as to form a horizontal support portion 228. Then, the suspension bolt 208 is passed through the through hole formed in the support portion 228, and is tightened from both the upper and lower sides of the support portion 228 by the nuts 230 screwed into the suspension bolt 208. As a result, the suspension bolt hanger 216 is fixed to the suspension bolt 208.

  As shown in FIG. 13, the cross T bar 204 is installed so as to be bridged between the main T bars 202, and the grandchild T bar 206 is installed so as to be bridged between the cross T bars 204.

  The outer peripheral edge of the ceiling plate 212 is supported by the flanges 202A, 204A, and 206A provided at the bottom of the main T bar 202, the cross T bar 204, and the grandchild T bar 206 to form a ceiling surface. .

  A gap 236 is formed between the outer peripheral edge of the ceiling of the system ceiling 200 and the side wall 234 to absorb the relative displacement that occurs between the outer peripheral edge of the ceiling and the side wall 234 during an earthquake. As shown in FIG. 13, the side wall 234 may be a side wall of the structural housing 214 or may be a non-structural housing such as a partition wall.

  The seismic resistance of the system ceiling 200 is achieved by arranging the brace material 210 obliquely from above the one suspension bolt 208 to below the other suspension bolt 208 and joining the brace material 210 and the suspension bolt 208 by welding or the like. The horizontal rigidity of the entire system ceiling 200 is increased and secured.

  Further, the lower end portion of the brace material 210 is joined to the suspension bolt hanger 216, or the lower portion of the brace member 210 and the main T bar 202, the cross T bar 204, or the grandchild T by an attachment hardware having the same structure as the suspension bolt hanger 216. In some cases, the horizontal rigidity of the entire system ceiling 200 is increased by joining the bar 206.

  However, the structure of the system ceiling 200 can hardly absorb vibration energy generated by an earthquake or the like.

  Therefore, when a large earthquake occurs, an excessive inertia force acts on the ceiling of the system ceiling 200, so that the ceiling is greatly shaken, the suspension bolt hanger 216 is loosened, the brace material 210 is buckled, and the like.

  Further, when the gap 236 cannot absorb the relative displacement generated between the outer peripheral edge of the ceiling of the system ceiling 200 and the side wall 234, the outer peripheral edge of the ceiling hits the side wall 234, and the outer peripheral edge and the side wall 234 are It can also be damaged.

  In the suspension ceiling vibration damping structure of Patent Document 1, as shown in FIG. 16, the ceiling member 242 is supported by the support member 240 suspended from the upper structural frame 238.

  In addition, a gap 246 is formed between the ceiling member 242 and the side wall 244 of the structural housing 238, and a deformable absorbing member 248 that can be expanded and contracted is provided in the gap 246.

  Furthermore, a damping damper 250 that absorbs horizontal vibration is installed between the ceiling member 242 and the structural housing 238.

  Since the gap 246 is formed between the ceiling member 242 and the side wall 244 of the structural housing 238, the ceiling member 242 vibrates greatly in the horizontal direction during an earthquake, but this vibration is effectively reduced by the damping damper 250. Is done.

  Further, the horizontal relative displacement generated between the outer peripheral edge of the ceiling member 242 and the side wall 244 of the structural housing 238 during an earthquake can be absorbed by the gap 246.

  However, it is necessary to newly install a large number of damping dampers 250 that were not on the ceiling of the conventional system, resulting in an increase in cost.

Further, in the renovation work, when it is necessary to provide the vibration dampers 250 in the place where the brace material is already installed, it is necessary to remove the brace material, and it is also necessary to dispose of the brace material that has become unnecessary. .
JP-A-2005-240538

  An object of the present invention is to provide a simple and low-cost suspended ceiling that suppresses the shaking of the ceiling that occurs during an earthquake and prevents damage to members constituting the ceiling.

  The invention according to claim 1 is formed between a ceiling beam that is suspended from a structural housing and supports at least one of a ceiling plate and a facility device that forms a ceiling, and an outer peripheral edge of the ceiling and a wall. A gap member, an oblique member provided to transmit the inertial force generated in the ceiling due to disturbance to the structural frame, and a connecting means provided on the oblique member to connect the oblique member and the support beam. The connecting means includes a holding member that sandwiches the support beam from both sides, and an energy absorbing means that is provided between the support beam and the holding member and absorbs vibration energy. It is a feature.

  In the first aspect of the invention, the support beam is suspended from the structural housing. And a support beam supports at least one of the ceiling board and equipment which form a ceiling.

  A gap is formed between the outer peripheral edge of the ceiling and the wall. Further, an oblique member is provided so as to transmit the inertial force generated on the ceiling due to disturbance to the structural frame.

  The oblique member is provided with connecting means, and the oblique member and the support beam are connected by the connecting means.

  The connecting means has a holding member and energy absorbing means. The holding member sandwiches the support beam from both sides, and the energy absorbing means is provided between the support beam and the holding member to absorb vibration energy.

  Here, since the seismic elements of the suspended ceiling are only diagonal members, most of the inertial force generated on the ceiling due to disturbance is transmitted to the structural frame via the diagonal members.

  That is, when an inertial force is generated on the ceiling due to a disturbance, the inertial force is transmitted in the order of the support beam, the energy absorbing means, the holding member, the oblique member, and the structural housing. In this way, the force concentrates on the connecting means (energy absorbing means, holding member) provided on the oblique member, and the support beam and the holding member relatively move in the horizontal direction.

  Then, the vibration energy causing relative movement between the support beam and the holding member is absorbed by the energy absorbing means.

  Thereby, the response displacement and response acceleration (inertial force) of the ceiling caused by disturbance can be reduced, and damage to the members constituting the ceiling can be prevented.

  Further, by providing the energy absorbing means in the connecting means where the force is most concentrated, vibration energy generated on the ceiling due to disturbance can be efficiently absorbed, and an excellent damping effect can be exhibited.

  Further, in the case of a suspended ceiling in which the lower part of the oblique member and the support beam are connected by an attachment hardware having a structure similar to that of a conventional suspension bolt hanger, the connection means of the present invention can be obtained simply by providing the attachment hardware with an energy absorbing means. become. Therefore, in the case of such a suspended ceiling, the construction labor is hardly increased, and a vibration damping function can be given to the existing suspended ceiling by a simple and low-cost method.

  Further, in such repair work, it is not necessary to remove the already installed diagonal member and provide another damper member or the like, so that the already installed diagonal member can be used effectively.

  Furthermore, in the case of a new construction work, a sufficient number of diagonal members can be provided as compared with a conventional suspended ceiling, so that a sufficient vibration damping function can be provided, so that cost reduction and workability improvement can be achieved.

  The invention according to claim 2 is characterized in that the energy absorbing means is a viscoelastic body.

  According to the second aspect of the present invention, when the support beam and the holding member relatively move in the horizontal direction, shear deformation occurs in the viscoelastic body serving as the energy absorbing means, and vibration energy is absorbed. The absorbed vibration energy is released as heat or sound.

  Thereby, the response displacement and response acceleration (inertial force) of the ceiling caused by disturbance can be reduced, and damage to the members constituting the ceiling can be prevented.

  Further, since the viscoelastic body is used as the energy absorbing means, the vibration energy absorbing effect can be exhibited even with a small amplitude vibration.

  In addition, since materials that are generally commercialized can be used, the cost can be reduced.

  The invention according to claim 3 is characterized in that the energy absorbing means is a rough surface layer formed on at least one of the surfaces where the support beam and the holding member are in contact with each other.

  In the invention according to claim 3, the rough surface layer formed on at least one of the surfaces where the support beam and the holding member are in contact is used as the energy absorbing means.

  Here, when the support beam and the holding member relatively move in the horizontal direction, the contact surfaces of the support beam and the holding member rub against each other. At this time, since a rough surface layer is formed on at least one surface of the support beam and the holding member, frictional heat is generated on the contact surface between the support beam and the holding member, and vibration energy is absorbed.

  Thereby, the response displacement and response acceleration (inertial force) of the ceiling caused by disturbance can be reduced, and damage to the members constituting the ceiling can be prevented.

  The rough surface layer can be formed by, for example, a generally used surface treatment method (for example, blast treatment or chemical treatment performed in steel construction), natural rusting, or the like.

  Therefore, it is not necessary to provide special parts, and it is only necessary to perform surface treatment on at least one surface of the support beam and the holding member in a factory or the like, so that the labor on site can be reduced.

  The invention described in claim 4 is characterized in that the lower portion of the holding member has elasticity, and the lower portion of the holding member is elastically deformed to sandwich the support beam.

  In the invention according to claim 4, when the holding member sandwiches the support beam, the frictional resistance of the contact surface between the support beam and the holding member is increased by the restoring force due to the elasticity of the lower part of the holding member.

  Therefore, large frictional heat can be generated, and the vibration energy absorption effect can be enhanced.

  Since the present invention has the above-described configuration, it is possible to provide a simple and low-cost suspended ceiling that suppresses the shaking of the ceiling that occurs during an earthquake and prevents damage to members constituting the ceiling.

  A suspended ceiling according to an embodiment of the present invention will be described with reference to the drawings.

  First, the suspended ceiling according to the first embodiment of the present invention will be described.

  As shown in the side view of FIG. 1 and the plan view of FIG. 2, the suspended ceiling 10 is a system ceiling, and includes a main T bar 14, a cross T bar 12, a grandchild T bar 16, suspension bolts 18A and 18B, and brace members. 20 and a ceiling plate 22.

  The suspension bolts 18 </ b> A and 18 </ b> B are suspended from the upper structural housing 24. Further, the main T bar 14 is attached to the lower ends of the suspension bolts 18A and 18B by suspension bolt hangers 26.

  Further, as shown in the plan view of FIG. 2, the cross T bar 12 is installed so as to be bridged between the main T bars 14, and the grandchild T bar 16 is installed so as to be bridged between the cross T bars 12. Yes.

  The outer peripheral edge of the ceiling plate 22 is supported by the flanges 14A, 12A, and 16A provided on the bottoms of the main T bar 14, the cross T bar 12, and the grandchild T bar 16 to form a ceiling surface. Similarly to the ceiling board 22, the equipment 28 such as lighting equipment and air conditioning equipment is supported by the main T bar 14, the cross T bar 12, and the grandchild T bar 16 to form a ceiling surface. When the weight of the equipment 28 is heavy, it may be hung from the structural housing 24 with a suspension bolt or the like.

  That is, the main T bar 14, the cross T bar 12, and the grandchild T bar 16 as support beams suspended from the structural frame 24 support at least one of the ceiling plate 22 and the equipment 28 that form the ceiling. .

  The structure of the suspension bolt hanger 26 is the same as that of the suspension bolt hanger 216 shown in FIGS. 14 and 15, and the main T bar 14 is held by sandwiching the main T bar 14 by opposing aluminum plate members. .

  In addition, the relative displacement that occurs between the outer peripheral edge 44 and the side wall 30 during an earthquake is caused between the outer peripheral edge 44 of the ceiling formed by the ceiling plate 22 and the equipment 28 and the side wall 30 of the structural housing 24. An absorbing gap 32 is formed. Thus, the gap 32 may be formed between the outer peripheral edge 44 of the ceiling and the side wall 30 of the structural housing 24, or between the outer peripheral edge 44 of the ceiling and a non-structural housing such as a partition wall. It may be formed.

  A brace member 20 as an oblique member made of C-shaped steel is provided obliquely from above the suspension bolt 18A located on the right side in FIG. Increases rigidity.

  The brace member 20 and the suspension bolt 18 </ b> A are joined by a joining member 34 provided at the upper end portion of the brace member 20.

  As shown in FIG. 3A, the joining member 34 is a plate member bent into a V shape, and a female screw 36 is formed in the vicinity of the V-shaped folded portion of the joining member 34. A male screw 38 provided at the upper end of the brace member 20 is screwed into the female screw 36. In addition, a hook portion 40 that hooks the suspension bolt 18 </ b> A is formed at each end portion of the joining member 34.

  When joining the brace member 20 to the suspension bolt 18A, first, the joining member 34 is rotated with respect to the male screw 38 provided at the upper end of the brace member 20 so that the hook portion 40 is hooked on the suspension bolt 18A. The length from the upper end of the brace member 20 to the joining member 34 is adjusted. Next, the suspension bolt 18A is pulled toward the upper end side of the brace member 20 (FIG. 3A), and the hook portion 40 is hooked on the suspension bolt 18A (FIG. 3B).

  As shown in FIG. 1, the brace member 20 and the main T bar 14 as a support beam are connected by a connecting member 42 as a connecting means provided at the lower end of the brace member 20.

  As shown in FIGS. 4 and 5, the connecting member 42 sandwiches the main T-bar 14 from both sides by opposing aluminum plate-like holding members 46 and 48. Thus, a frictional force is generated between the holding member 46 and the main T bar 14 and between the holding member 48 and the main T bar 14 to hold the main T bar 14.

  A viscoelastic body 50 is provided between the lower portions of the holding members 46 and 48 and the intermediate portion 62 of the main T bar 14 as energy absorbing means for absorbing vibration energy.

  The force for sandwiching the main T-bar 14 is such that the bolt 52 inserted through the through holes formed in the holding members 46 and 48 is screwed into the nut 54 at a position above the upper end of the main T-bar 14, and the bolt 52 is Give by tightening.

  The upper part 56 of the main T-bar 14 is hollowed, and the outer thickness thereof is thicker than the intermediate part 62. Further, the holding members 46 and 48 have a shape that substantially follows the outer shape of the main T-bar 14. Thus, when the bolt 52 is tightened, the main T bar 14 is securely held by the connecting member 42.

  The holding member 48 extends longer than the holding member 46. The brace member 20 is fixed to the upper side surface of the holding member 48. This fixing method may be any method as long as the force received by the connecting member 42 can be transmitted to the brace member 20. As shown in FIG. 5, a bolt 58 and a nut 60 may be used, or the holding member 48 may be welded or the like. The brace member 20 may be fixed to.

  In this way, the upper portion of the brace member 20 and the suspension bolt 18A are joined by the joining member 34, and the lower portion of the brace member 20 and the main T-bar 14 are joined by the connecting member 42, so that the brace member 20 is affected by disturbance such as an earthquake. Inertial force generated on the ceiling is transmitted to the structural housing 24.

  Next, the operation and effect of the suspended ceiling according to the first embodiment of the present invention will be described.

  As shown in FIG. 1, since the seismic element of the suspended ceiling 10 is only the brace member 20, most of the inertial force generated on the ceiling due to disturbance is transmitted to the structural housing 24 via the brace member 20.

  That is, when an inertial force is generated on the ceiling due to a disturbance such as an earthquake, the inertial force is transmitted in the order of the main T bar 14, the viscoelastic body 50, the holding members 46 and 48, the brace member 20, and the structural housing 24. In this way, the force concentrates on the connecting member 42 (viscoelastic body 50, holding members 46, 48) provided on the brace member 20, and the main T-bar 14 and the holding members 46, 48 are relative to each other in the horizontal direction. Moving.

  Then, shear deformation occurs in the viscoelastic body 50 and vibration energy is absorbed. At this time, the absorbed vibrational energy is released as heat or sound.

  Thereby, the response displacement and response acceleration (inertial force) of the ceiling caused by disturbance such as an earthquake can be reduced, and damage to the members constituting the ceiling can be prevented.

  Further, by providing the viscoelastic body 50 on the connecting member 42 where the force is most concentrated, vibration energy generated in the ceiling due to disturbance such as an earthquake can be efficiently absorbed, and an excellent damping effect can be exhibited. .

  Further, since the viscoelastic body 50 is used as the energy absorbing means, the vibration energy absorbing effect can be exhibited even with small amplitude vibration. In addition, since the viscoelastic body 50, which is a generally commercialized material, can be used, the cost can be reduced.

  In the case of a suspended ceiling in which the lower part of the brace member 20 and the main T bar 14 are connected by an attachment hardware having a structure similar to that of a conventional suspension bolt hanger such as the suspension bolt hanger 26, the attachment hardware is viscoelastic. The connection member 42 of the first embodiment is obtained simply by providing the body 50. Therefore, in the case of such a suspended ceiling, the construction labor is hardly increased, and the vibration control function can be given to the existing suspended ceiling by a simple and low-cost method.

  Further, in such repair work, it is not necessary to remove the already installed brace member and provide another damper member or the like, so that the already installed brace member can be used effectively.

  Furthermore, in the case of new construction work, a sufficient number of bracing members can be provided with a smaller number of brace members than in the conventional suspended ceiling, so that cost reduction and workability improvement can be achieved.

  The back of the ceiling where equipment is installed at a high altitude is very crowded with equipment piping and the like, and it is difficult to secure a sufficient space for installing brace members. Therefore, reducing the number of brace members installed is effective in improving earthquake resistance while maintaining facility performance.

  In the first embodiment, the viscoelastic body 50 is used as the energy absorbing means. However, it is preferable to use a thin sheet of about 1 mm as the viscoelastic body 50. When a thin sheet is used, it can be used as a holding member for the connecting member without improving the structure of the conventional suspension bolt hanger. Further, it is possible to prevent the viscoelastic body 50 from being softened and the relative movement amount between the main T bar 14 and the holding members 46 and 48 from becoming too large.

The material of the viscoelastic body 50 may be a material having both rigidity and viscosity. Since the diene rubber made by Showa Electric Wire has a shear elastic modulus of about 2.0 kg / cm ² and an equivalent damping constant of about 0.30, the material is suitable for the viscoelastic body 50 because of its high damping performance and general use. It is.

  In addition to the viscoelastic body 50, a material that absorbs vibration energy may be provided between the holding member 46 and the main T bar 14 and between the holding member 48 and the main T bar 14.

  In addition, a double-sided adhesive tape may be applied to both surfaces of the viscoelastic body 50, or a process for imparting tackiness to both surfaces of the viscoelastic body 50 may be performed. Accordingly, the viscoelastic body 50 can be easily attached to the main T bar 14 and the holding members 46 and 48 at the site. Since the shearing force borne by one brace member 20 is approximately 100 kg, the adhesive force of the double-sided adhesive tape or the adhesive treatment may be relatively small. In addition, if the viscoelastic body 50 is attached to the holding members 46 and 48 in advance at the factory, the work at the site can be reduced, and the construction labor can be reduced and the cost can be reduced.

  In the first embodiment, an example in which the viscoelastic body 50 is provided between the lower portions of the holding members 46 and 48 and the intermediate portion 62 of the main T bar 14 has been described. What is necessary is just to be provided between the holding members 46 and 48 to be performed and the main T bar 14. For example, as shown in FIG. 6, it may be provided between the intermediate portion of the holding members 46, 48 and the upper portion 56 of the main T bar 14, or the holding members 46, 48 and the upper portion 56 and intermediate portions of the main T bar 14. You may provide between both of the parts 62.

  In the first embodiment, an example in which the force for sandwiching the main T-bar 14 is given by tightening the bolt 52 is shown, but the viscoelastic body 50 and the holding members 46 and 48 and the viscoelastic body 50 are provided. Any method may be used as long as the main T-bar 14 is sandwiched with a force that does not cause slippage between the main T-bar 14 and a vise, a clip, or the like.

  When a sufficient force to pinch the main T bar 14 cannot be obtained simply by tightening the bolt 52 at a position above the upper end of the main T bar 14, as shown in FIG. A through hole (not shown) may be formed, and a force for sandwiching the main T-bar 14 from the lower part of the holding members 46 and 48 may be applied by a bolt 64 penetrating the through hole. In this case, the holes 66 formed in the holding members 46 and 48 for allowing the bolts 64 to pass therethrough are elongated holes for relatively moving the main T-bar 14 and the holding members 46 and 48.

  Next, a suspended ceiling according to a second embodiment of the present invention will be described.

  In the second embodiment, the energy absorbing means provided in the connecting member 42 of the suspended ceiling 10 of the first embodiment is a rough surface layer. Therefore, in the following description, the same components as those in the first embodiment are denoted by the same reference numerals and are appropriately omitted.

  As shown in FIG. 8, the surface where the lower portions of the holding members 46 and 48 of the connecting member 68 and the intermediate portion 62 of the main T bar 14 come into contact with each other is subjected to a roughening process to form a rough surface phase 70. Has been.

  Next, functions and effects of the suspended ceiling according to the second embodiment of the present invention will be described.

  In the second embodiment, when the main T bar 14 and the holding members 46, 48 move relative to each other in the horizontal direction, the contact surfaces of the main T bar 14 and the holding members 46, 48 rub against each other. At this time, since the rough surface layer 70 is formed on the surface where the lower portions of the holding members 46 and 48 and the intermediate portion 62 of the main T bar 14 are in contact with each other, the lower portions of the holding members 46 and 48 and the main T bar are formed. The frictional heat is generated on the contact surface with the intermediate portion 62 of 14 and the vibration energy is absorbed.

  Thereby, the response displacement and response acceleration (inertial force) of the ceiling caused by disturbance such as an earthquake can be reduced, and damage to the members constituting the ceiling can be prevented.

  The rough surface layer 70 can be formed by, for example, a generally used surface treatment method (for example, blast treatment or chemical treatment performed in steel construction), natural rusting, or the like.

  Therefore, since it is only necessary to perform surface treatment on the main T-bar 14 and the holding members 46 and 48 at a factory or the like without providing any special parts, it is possible to reduce labor on site.

  In the second embodiment, as in the first embodiment, an example in which the force for sandwiching the main T-bar 14 is given by tightening the bolt 52 is shown, but the lower portion of the holding members 46 and 48, the main Any method may be used as long as the main T-bar 14 is sandwiched with a force that generates frictional heat on the contact surface with the intermediate portion 62 of the T-bar 14, and a vise, a clip, or the like may be used.

  For example, the lower portions of the holding members 46 and 48 are formed of an elastic material, and the lower portions of the holding members 46 and 48 are bent so as to face downward on the main T-bar 14 side as shown in FIG. Keep it.

  In this way, as shown in FIG. 8B, when the holding members 46 and 48 sandwich the main T-bar 14, the lower portions of the holding members 46 and 48 are elastically deformed. Further, the frictional resistance of the contact surface between the lower portions of the holding members 46 and 48 and the intermediate portion 62 of the main T bar 14 is increased by the restoring force of the elastic deformation.

  Therefore, large frictional heat can be generated, and the vibration energy absorption effect can be enhanced.

  In the second embodiment, the rough surface layer 70 is formed on the surface where the lower portions of the holding members 46 and 48 and the intermediate portion 62 of the main T-bar 14 are in contact with each other. However, the rough surface layer 70 moves relatively. What is necessary is just to be provided between the holding members 46 and 48 and the main T bar 14. For example, as shown in FIG. 9, a rough surface layer 70 may be formed on the surface where the intermediate part of the holding members 46 and 48 and the upper part 56 of the main T-bar 14 come into contact with each other. The rough surface layer 70 may be formed on both the surfaces where the upper portion 56 and the intermediate portion 62 of the T-bar 14 are in contact with each other. Moreover, the rough surface layer 70 should just be formed in at least one of the surfaces where the holding members 46 and 48 and the main T-bar 14 contact.

  In the first and second embodiments, the material of the holding members 46 and 48 is aluminum. However, any material may be used as long as it has a strength for firmly sandwiching the support beam, and iron, plastic, or the like may be used.

  In the first and second embodiments, the upper part of the brace member 20 is joined to the suspension bolt 18A by the joining member 34 and connected to the main T-bar 14 by the connecting member 42. 20 may be provided on the suspended ceiling 10 so as to transmit the inertial force generated on the ceiling due to a disturbance such as an earthquake to the structural frame 24.

  Therefore, the upper part of the brace member 20 and the suspension bolt 18 </ b> A may be joined by welding or other joining methods, or the upper part of the brace member 20 may be joined to another member suspended from the structural housing 24. Then, the upper portion of the brace member 20 may be directly fixed to the structural housing 24.

  Further, the lower part of the brace member 20 may be connected to a support beam (cross T bar 12, grandchild T bar 16) other than the main T bar 14 by a connecting member 42, and the lower part of the brace member 20 may be connected by the connecting member 42. The main T bar 14 may be connected, and the connecting member 42 may be suspended by the suspension bolt 18B. Further, the outer shape of the supporting beam connected by the connecting member 42 may be any shape that can be sandwiched between the holding members 46 and 48, and the upper portion 56 is hollowed like the main T bar 14, and the outer thickness is intermediate. It does not have to be thicker than the portion 62. In this case, it is preferable that the shape of the holding members 46 and 48 is a shape substantially along the outer shape of the supporting beam to be sandwiched.

  In the first and second embodiments, the brace member 20 made of C-shaped steel is used as the diagonal member. However, the diagonal member generates the inertial force generated on the ceiling due to a disturbance such as an earthquake. Any material may be used as long as it has a rigidity capable of imparting horizontal rigidity to the entire suspended ceiling 10.

  In addition, although the example in which the gap portion 32 is formed between the side wall 30 of the structural housing 24 and the outer peripheral edge portion 44 of the ceiling is shown, the wall may be a non-structural housing such as a partition wall. In this case, if a gap is formed between the partition wall and the outer peripheral edge 44 of the ceiling, the same effects as those of the first and second embodiments can be exhibited.

As mentioned above, although 1st and 2nd embodiment of this invention was described, this invention is not limited to such embodiment at all, You may use combining 1st and 2nd embodiment, Needless to say, the present invention can be implemented in various modes without departing from the scope of the present invention.
(Example)
The effect of reducing the response displacement and response acceleration (inertial force) generated on the ceiling when a disturbance such as an earthquake acts on the suspended ceiling 10 of the first embodiment was verified by the ceiling analysis model 72 shown in FIG.

  As shown in FIG. 10, the ceiling analysis model 72 of the suspended ceiling 10 can be expressed as a model in which a brace analysis model 74 and a viscoelastic analysis model 76 are connected in series.

  The brace analysis model 74 is a model for one of the brace members 20 shown in FIG. 1, and a spring 78 and a damper 80 are connected in parallel.

  A mass M as a load (ceiling weight) applied to one brace member 20 was assumed to be 0.149 tf.

  Further, assuming that the spring constant K of the spring 78 is 0.15 t / cm and the damping constant h of the damper 80 is 0.02 (= 2%), the vibration of the ceiling (mass M) when there is no viscoelastic body. When the number f is 5.0 Hz, the damping coefficient C (= K × h / π × f) of the brace member 20 in the brace analysis model 74 is 0.00019 t / cm / s.

The viscoelastic body model 76 is a Voig model of the two viscoelastic bodies 50 provided on the connecting member 42 shown in FIG. 5, and a spring 82 and a damper 84 are connected in parallel. The plane dimension of the viscoelastic body 50 was 2 cm long × 5 cm wide (area A = 10 cm ² of the viscoelastic body 50), and the thickness t was 0.1 cm.

Here, if the shear elastic modulus G of the spring 82 is 2.0 kg / cm ² , the spring constant K (= A × G × 2 sheets / t) of the spring 82 is 0.40 t / cm.

  When the damping constant h of the damper 84 is 0.30 (= 30%) and the frequency f of the ceiling (mass M) having the viscoelastic body 50 is 4.39 Hz, a viscoelastic body model 76 is used. The damping coefficient C (= K × h / π × f) of the viscoelastic body 50 is 0.087 t / cm / s. In addition, the frequency f of the ceiling (mass M) in the case of having the viscoelastic body 50 is a value obtained by complex eigenvalue analysis.

  As a result of performing the complex eigenvalue analysis on the ceiling analysis model 72, when the frequency f of the ceiling (mass M) which was 5.0 Hz when the viscoelastic body is not present has the viscoelastic body 50. Was 4.39 Hz, and the damping constant h of the ceiling (mass M), which was 2% when the viscoelastic body was not provided, was 8.3% when the viscoelastic body 50 was provided.

  In other words, the coupling member 42 having the viscoelastic body 50 adds as much as 6.3% of attenuation to the ceiling of the suspended ceiling 10, so that the response displacement and response acceleration (inertial force) generated in the ceiling of the suspended ceiling 10 due to an earthquake or the like. It has been found that there is an effect of reducing.

  Next, the effect of reducing the response displacement generated in the ceiling of the suspended ceiling 10 due to an earthquake or the like by obtaining the minimum value of the displacement of the suspended ceiling 10 from the displacement response spectrum with respect to the vibration period of the suspended ceiling 10 at each attenuation. To evaluate.

  Reference numerals 86A, 88A, 90A, 92A, 94A, 96A, 98A, 100A, 102A, 104A, and 106A in FIG. 11 denote vibrations generated on the ceiling of the suspended ceiling 10 with respect to the period of vibrations generated on the ceiling of the suspended ceiling 10 due to an earthquake or the like. The value of the acceleration response spectrum is shown.

  Reference numerals 86A, 88A, 90A, 92A, 94A, 96A, 98A, 100A, 102A, 104A, and 106A have attenuations of 1%, 2%, 4%, 5%, 6%, 8%, 10%, and 14%, respectively. , 18%, 20%, and 22%.

  The value of 92A is the value of the acceleration response spectrum of 5% attenuation in the liberal engineering base of Notification No. 1461 of the Ministry of Land, Infrastructure, Transport and Tourism. The values of 86A, 88A, 90A, 94A, 96A, 98A, 100A, 102A, 104A, and 106A multiply the acceleration response spectrum value of 92A by Fh (= 1.5 / (1 + 10 × b)). Was determined by The variable b is a value of each attenuation.

  Then, the periods at the respective attenuations 86A, 88A, 90A, 92A, 94A, 96A, 98A, 100A, 102A, 104A, and 106A in FIG. 11 are obtained by complex eigenvalue analysis, and when these values are connected, a dotted line 108A is obtained. can get.

  The reference numerals 86B, 88B, 90B, 92B, 94B, 96B, 98B, 100B, 102B, 104B, and 106B in FIG. It shows the value of the displacement response spectrum.

  Reference numerals 86B, 88B, 90B, 92B, 94B, 96B, 98B, 100B, 102B, 104B, and 106B have attenuations of 1%, 2%, 4%, 5%, 6%, 8%, 10%, and 14%, respectively. , 18%, 20%, and 22%, and the values 86A, 88A, 90A, 92A, 94A, 96A, 98A, 100A, 102A, 104A, and 106A in FIG. 11 are integrated twice over time. It is the value.

  A dotted line 108B is a value obtained by integrating the dotted line 108A in FIG. 11 twice with respect to time.

Figure from the dotted line 108B shown in 12, it can be seen that the point P ₁ to minimize the displacement response spectrum ceiling suspended ceiling 10 is present. Further, the point _{P 1} is a point _{Q 1} is on a dotted line 108A in FIG. 11.

Therefore, as shown in FIG. 12, the attenuation does not have a viscoelastic body whereas displacement response spectrum points P ₂ 2% is 1 cm, and the attenuation provided viscoelastic body was 10% displacement response spectrum of the point _{P 1} becomes 0.85 cm. Thus, it can be seen that if the attenuation of the ceiling of the suspended ceiling 10 is 10% according to the first embodiment, the displacement of the ceiling can be reduced by about 15%.

Further, as shown in FIG. 11, an acceleration response spectrum attenuation having no viscoelastic body 2% points Q ₂ Whereas a 1000Gal, and the attenuation provided viscoelastic body was 10% acceleration response spectrum of a point _{Q 1} is a 600gal. Accordingly, it can be seen that if the attenuation of the ceiling of the suspended ceiling 10 is set to 10% according to the first embodiment, the response acceleration (inertial force) of the ceiling can be reduced by about 40%.

  As can be seen from this example, the first embodiment can reduce the response displacement and response acceleration (inertial force) of the ceiling caused by the disturbance, and prevent damage to the members constituting the ceiling.

  Further, the effect of reducing the response acceleration (inertial force) is greater than the effect of reducing the response displacement.

It is a side view which shows the suspended ceiling which concerns on the 1st Embodiment of this invention. It is a top view which shows the suspended ceiling which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the joining member which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the connection member which concerns on the 1st Embodiment of this invention. It is a front view which shows the connection member which concerns on the 1st Embodiment of this invention. It is a front view which shows the modification of the connection member which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the modification of the connection member which concerns on the 1st Embodiment of this invention. It is a front view which shows the connection member which concerns on the 2nd Embodiment of this invention. It is a front view which shows the modification of the connection member which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which shows the analysis model of the Example which concerns on embodiment of this invention. It is a diagram which shows the acceleration response spectrum with respect to a period in the analysis result of the Example which concerns on embodiment of this invention. It is a diagram which shows the displacement response spectrum with respect to a period in the analysis result of the Example which concerns on embodiment of this invention. It is a side view which shows the conventional system ceiling. It is a perspective view which shows the suspension bolt hanger used for the conventional system ceiling. It is a front view which shows the suspension bolt hanger used for the conventional system ceiling. It is a side view which shows the conventional damping structure of a suspended ceiling.

Explanation of symbols

10 Suspended ceiling 12 Cross T-bar (support beam)
14 Main T-bar (support beam)
16 Grandchild T-bar (support beam)
20 Brace member (oblique member)
22 Ceiling panel 24 Structural housing 28 Equipment 30 Side wall (wall)
32 Gap 42 Connection member (connection means)
44 outer peripheral edge 46 holding member 48 holding member 50 viscoelastic body (energy absorbing means)
68 Connecting member (connecting means)
70 Rough surface layer (energy absorption means)

Claims (4)

A support beam that is suspended from the structural frame and supports at least one of a ceiling plate and equipment that forms a ceiling, and
A gap formed between the outer peripheral edge of the ceiling and the wall;
An oblique member provided to transmit the inertial force generated in the ceiling due to disturbance to the structural frame;
A connecting means provided on the diagonal member for connecting the diagonal member and the support beam;
With
The connecting means includes
A holding member for sandwiching the support beam from both sides;
Energy absorbing means provided between the support beam and the holding member for absorbing vibration energy;
Suspended ceiling characterized by having.   The suspended ceiling according to claim 1, wherein the energy absorbing means is a viscoelastic body.   The suspended ceiling according to claim 1, wherein the energy absorbing means is a rough surface layer formed on at least one of surfaces on which the support beam and the holding member are in contact with each other. The lower part of the holding member has elasticity,
The suspended ceiling according to claim 3, wherein a lower portion of the holding member is elastically deformed to sandwich the support beam.

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