JP6050209B2 - Ceiling structure - Google Patents

Description

  The present invention relates to a ceiling structure, and more particularly to a ceiling structure in which a ceiling board is directly fixed to a lower surface of a ceiling base material.

  In the conventional ceiling structure, a plurality of field edge receivers (channels) supported by the ceiling slab via suspension bolts and arranged in parallel to each other, and parallel to each other arranged orthogonal to the field edge receivers. A ceiling base material is constituted by a plurality of field edges. The field edge is attached to the lower surface of the field edge receiver, and a ceiling board having a rectangular shape in plan view is fixed to the field edge from below with a gypsum board for eliminating unevenness. In such a ceiling structure, in order to improve earthquake resistance, Patent Document 1 discloses a ceiling structure in which a ceiling plate is bonded to a field edge with an adhesive, and the ceiling panel is fixed to the field edge using staples. Yes.

JP 2001-254474 A

  However, in the ceiling structure of Patent Document 1, since a rectangular ceiling plate is fixed to a plurality of field edges arranged in parallel to each other, usually only two long side portions of the peripheral edge portion of the ceiling plate are in the field. It will be fixed to the edge. In other words, the ceiling board is fixed only to the field edges extending in the same direction. For this reason, it cannot be said that the strength of such a ceiling structure against vibration is sufficient. In general, the suspension bolt is supported by hanging the field edge receiver, and the field edge itself is connected to the field edge receiver and is not directly connected to the suspension bolt. For this reason, in the conventional ceiling structure, it cannot be said that the field edge to which the ceiling plate is fixed has high earthquake resistance against vibrations in all directions. In order to solve these seismic resistance problems, the field edge is fixed to the field edge receiver using a coupling metal fitting, a reinforcing metal fitting, etc., and the ceiling plate is further fixed to the field edge edge to improve the earthquake resistance. Although it is conceivable, the number of parts increases. As a result, the cost increases and the workability deteriorates.

  This invention is made | formed in view of the said objective, The objective is to obtain the ceiling structure which has high earthquake resistance with a small number of parts.

  In order to achieve the above object, in the present invention, in the ceiling structure, the ceiling plate is fixed to the lower surfaces of the plurality of base materials assembled in a lattice shape so that the respective lower surfaces are at the same height position.

Specifically, the ceiling structure according to the present invention includes an upper surface of a plurality of ceiling boards formed in a rectangular shape in plan view on the lower surface of a plurality of elongated base materials suspended and supported by a ceiling slab via suspension bolts. The plurality of base materials are arranged so as to extend along each of the row direction and the column direction orthogonal to each other, and the lower surfaces thereof are at the same height position. Are arranged between a plurality of main base materials that are connected to each other in a square lattice shape in plan view and the main base material so that the lower surface thereof is at the same height as the lower surface of the main base material. including an auxiliary base member coupled to the main base member, a. In addition, the main base material is connected to the suspension bolts at all portions that are lattice points of the square lattice . The auxiliary base material is disposed between one of the main base materials in the row direction and the column direction so as to extend in parallel with the one main base material, and has the same shape as the longitudinal cross-sectional shape of the main base material. It has the 1st auxiliary | assistant base material formed. And the upper surface of each ceiling board is fixed to the lower surface of each main base material and the lower surface of the first auxiliary base material that are orthogonal to each other so as to extend along at least three sides of the peripheral edge. Features.

  According to the ceiling structure according to the present invention, since the plurality of base materials are assembled in a lattice shape so that the respective lower surfaces are at the same height position, not only the base material extending in one direction, but also Since the ceiling plate is directly fixed to the base material extending in the orthogonal direction, the ceiling plate can be stably fixed to the base material, and the earthquake resistance can be improved with a small number of parts without using a connecting bracket or the like. In addition, the main base material assembled in a square lattice shape in plan view is connected to the suspension bolt at all the lattice points, so the main base material is stably suspended and supported by the ceiling slab. Improves earthquake resistance. Moreover, since the main base material is particularly stably supported by the suspension bolt, the earthquake resistance can be improved by fixing the ceiling plate to at least one of the main base materials. Moreover, since the connection site | part of a suspension bolt and base material is arrange | positioned at the lattice point of a square lattice, the intensity | strength of the X direction and Y direction in the horizontal surface of a main base material can be improved.

In the ceiling structure according to the present invention, a plurality of first auxiliary base materials are disposed with a space between one main base material , and the upper surface of each ceiling plate is connected to the one main base material. it is preferred that the central portion between the two sides secured respectively to the first auxiliary base material is a solid wear on the lower surface of the first auxiliary base sheet other.

If it does in this way, the upper surface of a ceiling board will also adhere to the 1st auxiliary ground material provided in the center part between two sides each fixed to one main ground material and the 1st auxiliary ground material. Therefore, as a result of the ceiling plate is tightly fixed to the plurality of base material, it is Rukoto more to further improve the vibration resistance for various directions of vibration.

  In the ceiling structure according to the present invention, it is preferable that all of the main base materials constituting the four sides of the unit lattice of the square lattice are fixed to the ceiling plate.

  In this way, as described above, since the main base material is assembled in a square lattice shape with the suspension bolts as lattice points, the strength in the X direction and the Y direction in the horizontal plane of the main base material can be improved. By fixing the ceiling plate to all four sides of the unit lattice of the square lattice made of such a main base material, the diagonal strength in the horizontal plane of the main base material can be improved, and as a result, the earthquake resistance can be improved.

In the ceiling structure according to the present invention, the auxiliary base material is disposed between the other main base material in the row direction and the column direction so as to extend in parallel with the other main base material, and the longitudinal section of the main base material It has the 2nd auxiliary | assistant base material formed in the shape same as a shape. Both ends of the second auxiliary base material are connected to one main base material. The first auxiliary base material has one end connected to the other main base material and the other end connected to the second auxiliary base material. The upper surface of each top plate is along all four sides of the periphery of its, characterized in that it is secured to the lower surface and the lower surface of the first and second auxiliary base material of the main base sheet which are perpendicular to each other And

  If it does in this way, since a ceiling board will adhere to a ceiling base material more stably, it can improve the earthquake resistance of a ceiling board with respect to the vibration of all directions.

  In the ceiling structure according to the present invention, the ceiling board is preferably a rock wool sound absorbing board.

  If it does in this way, since a rock wool sound-absorbing board is lightweight, a lightweight ceiling structure can be implement | achieved and earthquake resistance can be improved.

  In the ceiling structure according to the present invention, the base material includes a horizontal plate portion having a lower surface to which the ceiling plate is fixed, and a vertical plate portion extending upward from the horizontal plate portion and connected to a suspension bolt. Is preferred.

  If it does in this way, since it consists of a horizontal board part to which a ceiling board adheres, and a vertical board part connected to a suspension bolt, a stable ceiling structure is realizable.

  In the ceiling structure according to the present invention, the horizontal plate portion is preferably provided with unevenness.

  If it does in this way, the rigidity in a horizontal board part can be improved and good earthquake resistance can be obtained.

  In the ceiling structure according to the present invention, it is preferable that the end portion of the horizontal plate portion is bent.

  If it does in this way, the rigidity in a horizontal board part can be improved and good earthquake resistance can be obtained.

  In the ceiling structure according to the present invention, it is preferable that the base material has a plug-in connection portion, and the base materials are connected to each other by the plug-in connection portion.

  If it does in this way, since it can mutually connect only by inserting one of the base materials into the other, while being able to reduce a number of parts, workability can be improved.

  According to the ceiling structure according to the present invention, a ceiling structure having high earthquake resistance can be obtained with a small number of parts.

It is a perspective view which shows the base material assembled in the grid | lattice form in the ceiling structure which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the state by which the ceiling board was fixed to a part of base material shown in FIG. It is an enlarged bottom view which shows the ceiling board of the area | region A of FIG. It is a perspective view which shows a 1st base material. It is an end view which cuts and shows the 1st foundation material. It is explanatory drawing which shows the state which fixed the ceiling board and the hanger to the 1st base material. It is a side view of the 1st foundation material which expands and shows the part in which the 1st connecting part was formed. It is a cross-sectional view of the 1st base material which expands and shows the site | part in which the 1st connection part was formed. It is a longitudinal cross-sectional view which shows a 2nd base material. It is a cross-sectional view showing a second base material. It is explanatory drawing which shows the connection method of a 1st base material and a 2nd base material. It is a cross-sectional view which shows the connection state of a 1st base material and a 2nd base material. It is a perspective view which shows the base material assembled in the grid | lattice form in the ceiling structure which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the state by which the ceiling board was fixed to a part of base material shown in FIG. It is an enlarged bottom view which shows the ceiling board of the area | region A of FIG. It is a perspective view which shows the ceiling structure of a comparative example.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its application, or its use.

(First embodiment)
First, the structure of the ceiling structure according to the first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, in the ceiling structure according to the first embodiment, a plurality of metal base materials 1a, 1b, 1c, and 1d are assembled in a lattice shape in plan view. Specifically, a plurality of long first base materials 1a are arranged in parallel with each other at a pitch of 1200 mm. Between the plurality of first base materials 1a, a plurality of second base materials 1b extending in a direction perpendicular to the first base material 1a and having both ends connected to the first base material 1a are provided at a pitch of 1200 mm. Similarly to the second base material 1b, the third base material is also provided at a pitch of 1200 mm. Specifically, the second base material 1b and the third base material 1c are parallel to each other, and the second base material 1b and the third base material 1c are alternately provided at a pitch of 600 mm. Between the 2nd base material 1b and the 3rd base material 1c, it extends in the direction perpendicular to them, ie, the direction parallel to the 1st base material 1a, one end is connected with the 2nd base material 1b, and the other end A plurality of fourth base materials 1d having portions connected to the third base material 1c are provided. The plurality of fourth base materials 1d are arranged in parallel to each other, and are provided at a pitch of 300 mm between two adjacent first base materials 1a. In this way, the base materials 1a, 1b, 1c, and 1d are assembled in a lattice pattern in plan view. Further, the lower surfaces of the base materials 1a, 1b, 1c, and 1d are connected to each other so as to be at the same height position.

  A hanger 2 is attached to the top of the first base material 1 a, and the first base material 1 a is connected to the suspension bolt 3 via the hanger 2. The suspension bolt 3 is used for a general ceiling structure, and its upper end is fixed to a ceiling slab (not shown) and its lower end is suspended near the ceiling. As a result, the first base material 1a is suspended and supported by the ceiling slab via the suspension bolt 3, and the second base material 1b and the third base material 1c connected to the first base material 1a are also supported. A fourth base material 1d connected to the second base material 1b and the third base material 1c is also supported.

  In the present embodiment, the hanger 2 is disposed in a portion of the first base material 1a where the second base material 1b is connected, that is, a lattice composed of the first base material 1a and the second base material 1b. It is disposed at a position to be a lattice point. That is, in this embodiment, both the row direction and the column direction are provided at a pitch of 1200 mm, and are arranged in a square lattice shape in plan view. Since the suspension bolt 3 connected to the first base material 1a via the hanger 2 is disposed at a position corresponding to the hanger 2, the suspension bolt 3 is also disposed in a square lattice shape in plan view. In other words, the first base material 1a is connected to the suspension bolt 3 via the hanger 2 at a portion corresponding to the lattice point, and the portion is arranged in a square lattice shape in plan view.

  Here, the connection part of the suspension bolt 3 and each base material is set as a grid point, and the base material that connects them, that is, the first base material 1a and the second base material 1b that form a grid line are called main base materials. Here, the smallest square in the square lattice having four apexes at four lattice points adjacent to each other (the connecting portion between the base material 1a and the suspension bolt 3) is referred to as a unit lattice. The third base material 1c and the fourth base material 1d arranged between the main base materials, in other words, in the unit cell, instead of the main base material, are called auxiliary base materials.

  In the ceiling structure of this embodiment, in order to improve the earthquake resistance of the ceiling structure, a brace 4 having a lower end connected to the second base material 1b and an upper end connected to the suspension bolt 3 (not shown) is provided. ing. In addition, the hanger 2, the suspension bolt 3, and the brace 4 can apply what is normally used in this technical field.

  As shown in FIG. 2, the upper surfaces of the plurality of ceiling plates 5 are fixed to the lower surfaces of the base materials 1a, 1b, 1c, and 1d. Since the lower surfaces of the base materials 1a, 1b, 1c, and 1d are connected to each other so as to have the same height, the ceiling plate 5 uses an adhesive on the lower surfaces of the base materials 1a, 1b, 1c, and 1d. It is fixed directly. As described above, the connection parts of the first base material 1a and the suspension bolts 3 are arranged in a square lattice shape having the connection parts as lattice points, and the ceiling plate 5 is formed of the base materials 1a, 1b, 1c, The first base material 1a and the second base material 1b, which are lattice lines of the square lattice of 1d, are fixed to the main base material. If it does in this way, the main base material used as the lattice line of the said square lattice among the base materials 1a, 1b, 1c, and 1d will be supported especially stably by the suspension bolt 3 arrange | positioned in the position used as a lattice point. Therefore, the earthquake resistance can be improved by fixing the ceiling plate 5 to at least one of the main base materials. In the present embodiment, not only the main base material but also the third base material 1c and the fourth base material 1d arranged in a plurality of unit lattices constituting the square lattice, that is, the auxiliary base material are ceiling boards. Since 5 is fixed, the ceiling board 5 can be fixed more firmly, and as a result, earthquake resistance can be improved. In the present embodiment, all the main base materials constituting the four sides of the unit lattice of the square lattice are fixed to the ceiling plate 5.

  In the present embodiment, a ceiling plate 5 having a square shape of 600 mm × 600 mm is used, and one corner of the ceiling plate 5 is arranged so as to be located at a portion where the hanger 2 is provided. If it does in this way, four ceiling boards will be provided in the said square lattice. At this time, as shown in FIG. 3, all four sides at the peripheral edge of the upper surface of the ceiling plate 5 are directly fixed to any one of the base materials 1a, 1b, 1c, and 1d. In FIG. 3, the illustration of the ceiling panel adjacent to the ceiling panel 5 is omitted for simplification of the drawing. Specifically, one side of the peripheral portion of the ceiling board 5 is fixed to the first base material 1a, one side facing the one side is fixed to the fourth base material 1d, and one of the remaining two sides facing each other. Is fixed to the second base material 1b, and the other side is fixed to the third base material 1c. Further, not only the peripheral portion of the ceiling plate 5 but also the central portion between the side fixed to the first base material 1a and the side fixed to the fourth base material 1d is fixed to the other fourth base material 1d. ing. Thus, since the ceiling board 5 is fixed to the lower surface of the base materials 1a, 1b, 1c, and 1d so as to follow all four sides at the peripheral edge, it is possible to improve the earthquake resistance against vibrations in various directions. it can.

In the present embodiment, the ceiling plate 5 is fixed to the lower surface of the base materials 1a, 1b, 1c, 1d with an adhesive, but in addition to this, the ceiling plate 5 is attached to the base materials 1a, 1b, You may adhere to the lower surface of 1c, and may combine these. Moreover, as the ceiling board 5, a gypsum board, a wood board, etc. can be used, However, it is not restricted to these in particular, A single layer board or a multilayer board may be sufficient. The ceiling plate 5 also includes a laminated plate made of a base plate such as a gypsum board that is directly fixed to the base materials 1a, 1b, 1c, and 1d and a decorative material attached to the lower surface of the base plate. . Preferably, the ceiling board 5 is a rock wool makeup sound absorbing board.
Use of a lightweight rock wool decorative sound-absorbing board as the ceiling board 5 is advantageous in obtaining good earthquake resistance. In the present embodiment, the ceiling plate 5 having a square shape in plan view is used. However, the present invention is not limited to this, and a ceiling plate 5 having a rectangular shape in plan view may be used.

  Next, the structure of the base materials 1a, 1b, 1c, and 1d in this embodiment will be described. The first base material 1a, the second base material 1b, the third base material 1c, and the fourth base material 1d are each a long member formed by forming a strip-shaped metal plate, and they are connected to each other. For this reason, only the structure of the connecting portion is different, and the longitudinal sectional shape is the same.

  First, the shape of the first base material 1a will be described with reference to FIGS. As shown in FIG.4 and FIG.5, the 1st base material 1a is a thing formed by bending one strip | belt-shaped steel plate so that a longitudinal cross-sectional shape may become a substantially reverse T shape. The first base material 1a is positioned on the lower side, and is fixed to a horizontal plate portion 11 to which the ceiling plate 5 is fixed, and extends upward from the horizontal plate portion 11 and connected to the suspension bolt 3 via the hanger 2. And a vertical plate portion 12. The vertical plate portion 12 is formed by overlapping two steel plates, and the horizontal plate portion 11 is formed by bending the double steel plate at the lower end portion of the vertical plate portion 12 in opposite directions at substantially right angles. It is comprised so that it may extend. Further, a connection portion 13 connected to the hanger 2 is provided at the upper end portion of the vertical plate portion 12. The connecting portion 13 is bulged by bending the strip steel plate so that the upper end portion of the vertically stacked vertical plate portion 12 is enlarged in the thickness direction.

  As shown in FIG. 6, the hanger 2 is attached to the connection part 13 formed as described above. Specifically, the hanger 2 has a sandwiching portion 2a composed of a pair of sandwiching pieces that can be separated from each other at the lower end thereof, and the sandwiching portion 2a sandwiches the connecting portion 13 to thereby form the first base material 1a. A hanger 2 is attached to the top of the. Further, the hanger 2 has a through hole 2b penetrating the suspension bolt 3 at the upper portion thereof, and the suspension bolt 3 is penetrated through the through hole 2b and is connected to each other by fastening using a fastening member such as a nut. Has been. However, the hanger 2 and the suspension bolt 3 are not limited to those having such a configuration, and those normally used in this technical field can be applied as described above. On the lower surface of the connecting portion 13, groove portions 13 a that are recessed upward are formed along the longitudinal direction on both sides of the upper end portion of the vertical plate portion 12. The groove 13a includes, for example, a metal fitting for connecting the first base material 1a in the longitudinal direction, and a metal fitting for reinforcing a connecting portion between the first base material 1a and the second base material 1b or the third base material 1c. Etc. can be mounted.

  Further, as described above, the vertical plate portion 12 is configured by overlapping steel plates, and the vertical plate portion 12 has a caulking portion 14 formed by caulking the stacked steel plates in the longitudinal direction. Are formed at regular intervals. This prevents the stacked steel plates constituting the vertical plate portion 12 from shifting or separating from each other.

  As shown in FIG. 6, the ceiling plate 5 is fixed to the lower surface of the horizontal plate portion 11 with an adhesive (not shown). Here, the ceiling plate 5 is fixed to the lower surface of the horizontal plate portion 11 with an adhesive. However, for example, a tapping screw or a staple may be used, and further, they may be combined. Different ceiling plates 5 are fixed to the horizontal plate portion 11 at two portions extending from the vertical plate portion 12 to the opposite sides.

  Further, both end portions on the outer side of the horizontal plate portion 11 are bent and provided with standing portions 15 that are bent upward. The standing portion 15 is for improving the rigidity of the horizontal plate portion 11. Since the upright portion 15 stands up without being folded back inward, for example, when the ceiling plate 5 is fixed to the horizontal plate portion 11 using a tapping screw, the tapping screw can be prevented from interfering with the upright portion 15. Further, the horizontal plate portion 11 is formed with ribs 16 protruding upward on both sides of the lower end portion of the vertical plate portion 12, and a groove portion recessed downward is formed between the rib 16 and the vertical plate portion 12. 17 is formed. In the groove portion 17, for example, a metal fitting for connecting the first base material 1 a in the longitudinal direction, or a metal fitting for reinforcing a connecting portion between the first base material 1 a and the second base material 1 b or the third base material 1 c. Etc. can be mounted. Further, the horizontal plate portion 11 may be provided with unevenness. By doing in this way, the rigidity of the horizontal board part 11 can be improved.

  The main structure of the first base material 1a has been described above, but the second base material 1b, the third base material 1c, and the fourth base material 1d also have the same structure as described above, and each is connected as described above. The structure of the connection part for being made is different. Therefore, the configuration of the connecting portion will be described below.

  First, the 1st connection part 20 which the 1st base material 1a has is demonstrated, referring FIG.7 and FIG.8.

  As shown in FIG.7 and FIG.8, it connects to the 2nd base material 1b or the 3rd base material 1c in each of the two side surfaces (surface and back surface) of the vertical board part 12 in the 1st base material 1a. The 1st connection part 20 is provided. 7 and 8, the pair of first connecting portions 20 is illustrated, but a plurality of second base materials 1b and third base materials 1c are alternately connected to the first base material 1a at a pitch of 600 mm. Therefore, the first connecting portions 20 are also provided on each of the two side surfaces of the vertical plate portion 12 at a pitch of 600 mm.

  The 1st connection part 20 has the bulging part 21 cut and raised by the thickness direction of a board surface. Moreover, the 1st connection part 20 is the space between the bulging part 21 and the side surface of the vertical board part 12, and the insertion part 41 of the 2nd connection part 40 of the 2nd base material 1b demonstrated later is penetrated It has an insertion part 22. The insertion part 22 has an inlet 22a for inserting the insertion part 41 of the second connecting part 40, and an outlet 22b for the insertion part 41 to go outward from the insertion part 22.

  In the vicinity of the insertion portion 22 on the outlet 22b side, an engagement protrusion 23 formed by cutting and raising in the thickness direction of the plate surface of the first base material 1a is formed. The engagement protrusion 23 is for engaging with an engagement hole 42 in the second connecting portion 40 such as a second base material 1b described later. Moreover, the 1st connection part 20 has the positioning protrusion 24 for the positioning in connection with the 2nd base material 1b. The positioning projection 24 is formed by performing a U-shaped cutting process on the side surface of the first base material 1a and vertically cutting and raising it to the insertion portion 22 side. The positioning protrusion 24 engages with a positioning hole 43 in the second connecting portion 40 such as a second base material 1b described later.

  Next, the 2nd connection part 40 provided in the 2nd base material 1b is demonstrated, referring FIG.9 and FIG.10. The second connecting part 40 is a member that can be connected to the first connecting part 20.

  As shown in FIGS. 9 and 10, the second base material 1 b has the same vertical cross-sectional shape as the first base material 1 a, and the second connecting portions 40 are provided at both ends in the longitudinal direction. . Specifically, the 2nd connection part 40 is formed by extending the double piled steel plate which comprises the vertical board part 12 of the 2nd base material 1b to an edge part direction. The second connecting portion 40 is bent into a substantially L shape in plan view, and the insertion portion 41 that is the bent end portion can be inserted into the insertion portion 22 of the first connecting portion 20. Is formed. The insertion portion 41 is formed so that the cross-sectional shape thereof is equivalent to the shape of the insertion portion 22 so that the insertion portion 41 can be inserted into the insertion portion 22 of the first connecting portion 20 and does not rattle after insertion. Further, in the second connecting portion 40, when the first base material 1a and the second base material 1b are connected, the distal end portion 44 of the insertion portion 41 inserted into the insertion portion 22 protrudes from the outlet 22b of the insertion portion 22. Is configured to do.

An engagement hole 42 is formed in the central portion near the distal end side of the insertion portion 41. The engagement hole 42 is a hole formed so as to penetrate the insertion portion 41 in the thickness direction, and the first base material 1a is engaged when the first base material 1a and the second base material 1b are connected. It is configured to engage with the protrusion 23. In addition, a cutout positioning hole 43 is formed in the distal end portion 44 of the insertion portion 41.
The positioning hole 43 is engaged with the positioning protrusion 24 of the first base material 1a when the first base material 1a and the second base material 1b are connected, and defines the tip position of the second connecting portion 40. is there.

  Next, a connection state between the first base material 1a and the second base material 1b will be described with reference to FIGS.

  As shown in FIG.11 and FIG.12, the 1st connection part 20 and the 2nd connection part 40 are insertion type connection parts, and specifically, the insertion part in the 2nd connection part 40 of the 2nd base material 1b. By inserting 41 into the insertion part 22 from the inlet 22a in the 1st connection part 20 of the 1st base material 1a, the 1st base material 1a and the 2nd base material 1b can be connected in T shape. By inserting the insertion portion 41 until the positioning hole 43 of the second base material 1b engages with the positioning projection 24, the engagement hole 42 and the engagement projection 23 are engaged, and the insertion portion 41 becomes the first connecting portion 20. The insertion portion 22 is locked. Thereby, the 1st base material 1a and the 2nd base material 1b are connected in T shape.

  The structure of the first base material 1a and the second base material 1b and their connection have been described above. However, the third base material 1c has the same structure as the second base material 1b, and the first base material 1a and the third base material 1b. Since the connection with the base material 1c is the same as the connection state between the first base material 1a and the second base material 1b, description thereof is omitted.

  Next, the connection between the second base material 1b and the fourth base material 1d will be described. The second base material 1b and the fourth base material 1d are connected by the first connecting portion 20 and the second connecting portion 40, similarly to the connection of the first base material 1a and the second base material 1b. As described above, the second base material 1b has the second connecting portions 40 at both ends in the longitudinal direction. Further, like the first base material 1a, a plurality of second base materials 1b are provided on the side surfaces of the vertical plate portion 12. One connecting portion 20 is provided. Since the plurality of fourth base materials 1d are connected to the second base material 1b at a pitch of 300 mm, the first connecting portions 20 are also provided on each of the two side surfaces of the vertical plate portion 12 at a pitch of 300 mm. In addition, since the 1st connection part 20 provided in the 1st base material 1a and the 1st connection part 20 provided in the 2nd base material 1b are the same structures, description is abbreviate | omitted.

  On the other hand, the 4th base material 1d is provided with the 2nd connection part 40 in the longitudinal direction both ends similarly to the 2nd base material 1b. Here, since the 2nd connection part 40 provided in the 2nd base material 1b and the 2nd connection part 40 provided in the 4th base material 1d are the same structures, description is abbreviate | omitted.

  The first connecting portion 20 of the second base material 1b and the second connecting portion 40 of the fourth base material 1d are the same as in FIGS. 11 and 12, and the insertion portion 41 of the second connecting portion 40 is the first connecting portion 20. The engagement hole 42 and the positioning hole 43 of the second connection part 40 are connected to each other by being engaged with the engagement protrusion 23 and the positioning protrusion 24 of the first connection part 20 respectively. Thereby, the 2nd base material 1b and the 4th base material 1d are connected in T shape.

  The connection between the second base material 1b and the fourth base material 1d has been described above. However, the third base material 1c has the same structure as the second base material 1b, and the third base material 1c and the fourth base material 1d. Since the connection with is the same as the connection state between the second base material 1b and the fourth base material 1d, description thereof is omitted.

  As described above, the first base material 1a, the second base material 1b, and the third base material 1c are connected, the second base material 1b, the third base material 1c, and the fourth base material 1d are connected, By assembling them in a lattice shape as shown in FIG. 1, a ceiling base structure for attaching a ceiling board can be produced.

(Second Embodiment)
The ceiling structure according to the second embodiment of the present invention will be described below. In the present embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different portions will be described in detail. The present embodiment differs from the first embodiment in that the fourth base material 1d is not provided and the arrangement pitch of the third base material 1c is different.

  As shown in FIG. 13, in the ceiling structure according to the second embodiment, a plurality of metal base materials 1a, 1b, and 1c are assembled in a lattice shape. Specifically, a plurality of long first base materials 1a are arranged in parallel with each other at a pitch of 1200 mm. Between the plurality of first base materials 1a, a plurality of second base materials 1b extending in a direction perpendicular to the first base material 1a and having both ends connected to the first base material 1a are provided at a pitch of 1200 mm. ing. The plurality of second base materials 1b are arranged in parallel to each other. Similarly to the second base material 1b, a plurality of third base materials 1c extending in a direction perpendicular to the first base material 1a and having both end portions connected to the first base material 1a are provided. The plurality of third base materials 1c are arranged in parallel to each other, and three third base materials 1c are provided at a pitch of 300 mm between two adjacent second base materials 1b. In this way, the base materials 1a, 1b, and 1c are assembled in a lattice shape in plan view. Further, the lower surfaces of the base materials 1a, 1b, and 1c are connected to each other so as to be at the same height position. In FIG. 13, unlike FIG. 1, the brace 4 is not shown for the sake of simplicity.

  As shown in FIG. 14, a plurality of ceiling plates 5 are fixed to the lower surfaces of the base materials 1a, 1b, and 1c. In the present embodiment, as in the first embodiment, a ceiling plate 5 having a square shape of 600 mm × 600 mm is used, and one corner of the ceiling plate 5 is located at a portion where the hanger 2 is provided. Are arranged to be. At this time, as shown in FIG. 15, the ceiling board 5 is directly fixed to any one of the base materials 1 a, 1 b, and 1 c at the periphery of the upper surface of the ceiling board 5. In FIG. 15, illustration of the ceiling panel adjacent to the ceiling panel 5 is omitted for simplification of the drawing. Specifically, one side of the peripheral portion of the ceiling plate 5 is fixed to the first base material 1a, one of the two sides perpendicular to the one side is fixed to the second base material 1b, and the other side is the first side. 3 It is fixed to the base material 1c. Moreover, not only the peripheral part of the ceiling board 5, but the center part between the two sides respectively fixed to the second base material 1b and the third base material 1c is fixed to the other third base material 1c. . Thus, since the ceiling board 5 is fixed to the lower surface of the base materials 1a, 1b, and 1c so as to extend along the three sides of the peripheral edge portion, it is inferior to the ceiling structure of the first embodiment, Seismic resistance can be improved compared to the ceiling structure.

  Below, the Example for demonstrating in detail the ceiling structure which concerns on this invention is shown. In this example, a horizontal load test was performed on the ceiling structure according to the present invention, and its earthquake resistance was examined.

  In the ceiling structure according to this example, the base materials were assembled and supported by hanging bolts via a hanger according to the ceiling structure according to the first embodiment. As the ceiling board, a rock wool decorative sound absorbing board having a thickness of 12 mm was used.

  On the other hand, the ceiling structure of the conventional construction method was produced as a comparative example. Specifically, as shown in FIG. 16, it is arranged on the lower surface of a plurality of C channels 101 having a substantially C-shaped cross section supported by hanging bolts 103 via hangers 102 so as to be orthogonal to the C channel 101. A plurality of M bars 104 having a substantially M-shaped cross section were disposed, and a decorative gypsum board 105 having a thickness of 9.5 mm was fixed to the lower surface of the M bars. The suspension bolts 103 are disposed at a pitch of 900 mm, and are disposed at portions where the C channel 101 and the M bar 104 do not intersect. The M bars 104 are arranged at a pitch of 227.5 mm. The decorative plaster board 105 has a size of 455 mm × 910 mm, and is fixed only to the M bar 104 as described above.

  A horizontal load test according to the description of JIS A1445 was performed on the ceiling structure according to the above example and the ceiling structure according to the comparative example. As a result, the braces required when the design seismic force was 2.2 G were 1 pair / 20 m 2 in the example, and 1 pair / 12 m 2 in the comparative example.

  From the above results, it is suggested that the ceiling structure of the example has higher seismic performance than the ceiling structure of the comparative example.

  The present invention is useful for various ceiling structures that require high earthquake resistance.

1a First base material (main base material)
1b Second base material (main base material)
1c 3rd base material (auxiliary base material)
1d 4th base material (auxiliary base material)
2 Hanger 3 Suspension bolt 4 Brace 5 Ceiling plate 11 Horizontal plate portion 12 Vertical plate portion 13 Connection portion 14 Caulking portion 15 Standing portion 16 Rib 17 Groove portion 20 First connecting portion 40 Second connecting portion

Claims (9)

A ceiling structure in which the upper surfaces of a plurality of ceiling plates formed in a square shape in plan view are directly fixed to the lower surfaces of a plurality of long base materials suspended and supported by a ceiling slab via suspension bolts. ,
The plurality of base materials are:
A plurality of main bases arranged in a square lattice in plan view, arranged so as to extend along each of the row direction and the column direction orthogonal to each other, and their lower surfaces are connected to each other at the same height position Material ,
An auxiliary base material disposed between the main base materials and connected to the main base material such that the lower surface thereof is at the same height as the lower surface of the main base material ,
The main base material is connected to the suspension bolts at all sites that are lattice points of the square lattice,
The auxiliary base material is disposed between the main base materials in one of the row direction and the column direction so as to extend in parallel with the one main base material, and has the same vertical cross-sectional shape as the main base material Having a first auxiliary base material formed in a shape;
The upper surface of each ceiling plate is fixed to the lower surface of each of the main base materials and the lower surface of the first auxiliary base material that are orthogonal to each other so as to extend along at least three sides of the peripheral portion. Ceiling structure characterized by A plurality of the first auxiliary base materials are arranged at intervals between the one main base material,
It said top surface of each ceiling plate, the central portion is solid deposition on the lower surface of the other of the first auxiliary substrate material between the two sides which are respectively fixed the one to the main base material and the first auxiliary substrate material The ceiling structure according to claim 1, wherein the ceiling structure is provided.   The ceiling structure according to claim 1 or 2, wherein all of the main base material constituting the four sides of the unit lattice of the square lattice are fixed to the ceiling plate. The auxiliary base material is disposed between the other main base material in the row direction and the column direction so as to extend in parallel with the other main base material, and has the same shape as the longitudinal sectional shape of the main base material. Having a second auxiliary base material formed;
The second auxiliary base material has both ends connected to the one main base material, respectively.
The first auxiliary base material has one end connected to the other main base material and the other end connected to the second auxiliary base material,
Upper surface of each top plate is along all four sides of the periphery of its, that is fixed to the lower surface of the lower surface and the first and second auxiliary substrate material of the respective main base sheet which are perpendicular to each other The ceiling structure according to any one of claims 1 to 3, wherein   The ceiling structure according to any one of claims 1 to 4, wherein the ceiling board is a rock wool sound absorbing board.   2. The base material includes a horizontal plate portion having a lower surface to which the ceiling plate is fixed, and a vertical plate portion extending upward from the horizontal plate portion and connected to a suspension bolt. The ceiling structure according to any one of?   The ceiling structure according to claim 6, wherein the horizontal plate portion is provided with unevenness.   The ceiling structure according to claim 6 or 7, wherein an end portion of the horizontal plate portion is bent.   The ceiling structure according to any one of claims 1 to 8, wherein the base material has a plug-in connection part, and the base materials are connected to each other by the plug-in connection part.

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