JP7375237B2 - Earthquake-resistant ceiling structure - Google Patents

Description

The present invention relates to an earthquake-resistant ceiling structure.

Hitherto, suspended ceilings have been widely used as ceilings in buildings such as schools, hospitals, production facilities, gymnasiums, swimming pools, airport terminal buildings, office buildings, theaters, and cinema complexes. Such a suspended ceiling has a plurality of roof edges arranged in parallel at a predetermined interval in one horizontal direction, and a plurality of roof edges arranged in parallel at a predetermined interval in the other horizontal direction perpendicular to the roof border. The lower end is connected to the roof edge and the upper end is fixed to the upper structure (building frame) such as the flooring on the upper floor. It is comprised of a plurality of hanging bolts (hanging members) and a ceiling panel that is integrally attached to the underside of the veranda with screws or the like and forms the ceiling surface of the lower floor.

On the other hand, a suspended ceiling formed by suspending and supporting the roof edge and the ceiling base of the roof edge support and the ceiling panel using hanging members is subject to horizontal sway due to the horizontal acceleration that is applied during an earthquake. Structurally, ceiling panels behave differently from the building frame and tend to amplify lateral shaking, so there is a risk that the ceiling panels will collide with the building frame such as walls, columns, beams, etc. and be damaged and fall off. Ta.

In order to prevent such suspended ceilings from falling, there are known methods such as installing diagonal members as earthquake-resistant members and placing walls around the ceiling that bear the earthquake force as described in Ministry of Land, Infrastructure, Transport and Tourism Notification No. 791. It is being
As another example, as shown in Patent Document 1, for example, a substantially rod-shaped tension member is provided below a ceiling panel and laterally along the ceiling panel, and both ends of this tension member are attached to a building. The ceiling panel and the building frame can be connected to the building frame by connecting and fixing the middle part between both ends to the ceiling panel and/or the roof edge from below the ceiling panel using a connecting and fixing means. At the same time, earthquake-resistant ceiling structures that improve the seismic performance of ceiling panels and direct ceilings, which are not suspended ceilings, but in which the ceiling is directly attached to a trellis made of columns and beams, are known.

Japanese Patent Application Publication No. 2013-177801

In clean rooms where the amount of dust in the air must be controlled, outdoor eaves in humid environments, indoor pools, hot bath facilities, etc., it is necessary to connect walls, columns, beams, etc. around the ceiling to ensure airtightness. It is preferable that there is no clearance (hereinafter referred to as ceiling clearance) with the constituent members. In addition, since clean rooms have many facilities under the ceiling, interference with earthquake-resistant members becomes a problem.
The method of installing diagonal members as earthquake-resistant members is because the ceiling panel moves in sync with the upper structure from which it is suspended and moves differently from the pillars and walls surrounding the ceiling, which creates clearances around the ceiling that make it difficult to maintain airtightness. In the case of placing walls, etc. that bear the seismic force around the ceiling, there is usually no clearance around the ceiling, but in the event of an earthquake, the ceiling panel and the wall, etc. that bear the seismic force collide. The airtightness of the clean room is lost because of the gaps created.
If you create a structure like the one in Patent Document 1, where the ceiling is fixed directly to the grape trellis or a tensile material is placed on the underside of the ceiling panel to provide earthquake resistance, it will be easier to maintain airtightness during an earthquake. In the case of direct ceilings using shelves, in addition to the problems of high cost and increased load, the height of the ceiling surface increases due to interference adjustment with equipment in the ceiling, which causes the height of the ceiling surface to become lower. was there.
In addition, if a tensile material is placed on the lower surface of the ceiling panel to create an earthquake-resistant structure as in Patent Document 1, there will be problems with the required performance of clean rooms that do not like irregularities on the ceiling surface from the perspective of preventing dust from adhering. was there.

The present invention has been made in view of the above-mentioned problems, and it is possible to realize a ceiling structure with high load-bearing rigidity.In addition, by providing an earthquake-resistant structure in the ceiling base, geometrical restrictions such as unevenness on the finished surface of the ceiling are avoided. It is to provide an earthquake-resistant ceiling structure.

In order to achieve the above object, the earthquake-resistant ceiling structure according to the present invention includes: a field edge support that is suspended and supported by the upper structure of a building frame via a hanging member; an earthquake-resistant ceiling structure, comprising: a ceiling panel attached to the lower surface of the edge; A long horizontal force propagation member is provided, and the horizontal force propagation member is arranged with its extension direction facing two different directions, and a first horizontal force propagation member and a second horizontal force propagation member extending in two directions are provided. The force propagation materials are arranged at the same height, and the intersection of the first horizontal force propagation material and the second horizontal force propagation material is open in the vertical direction with respect to at least one of the horizontal force propagation materials. A cutout recess is formed, and the other horizontal force propagation member is fitted into the cutout recess so as to be movable in the extending direction of the other horizontal force propagation member.

In the present invention, since the first horizontal force propagating material and the second horizontal force propagating material intersect at the same height position, the first horizontal force propagating material Both the second horizontal force propagation members can be directly joined to the ceiling panel, and the flow of force can be simplified without being affected by the strength and rigidity of other members or joints of the members.

According to the present invention, it is possible to realize a ceiling structure with high load-bearing rigidity, and by providing an earthquake-resistant structure in the ceiling base, it is possible to provide an earthquake-resistant ceiling structure that does not cause geometric restrictions such as unevenness on the finished surface of the ceiling. .

FIG. 1 is a perspective view showing an earthquake-resistant ceiling structure according to an embodiment of the present invention. FIG. 2 is a side sectional view of the earthquake-resistant ceiling structure shown in FIG. 1 viewed from a second lateral direction. FIG. 2 is a plan view of one section of the earthquake-resistant ceiling structure shown in FIG. 1 viewed from above, with the field edge receiver and field edge omitted. In the earthquake-resistant ceiling structure shown in FIG. 2, it is a side sectional view showing the principal part of the joint part of the horizontal force propagation material made of a field edge support material, and the support beam of a building frame. In the earthquake-resistant ceiling structure shown in FIG. 2, it is a side sectional view showing the main part of the joint part of the horizontal force propagation material made of a field edge material and the support beam of a building frame. FIG. 3 is a diagram showing a connecting part of horizontal force propagation materials made of extruded aluminum sections, in which (a) is a plan view seen from above, (b) is a side sectional view, and (c) is (a) and (b). FIG. 2 is a cross-sectional view taken along line AA shown in FIG. FIG. 3 is a diagram showing an intersection of horizontal force propagation materials made of extruded aluminum sections, in which (a) is a plan view seen from above, (b) is a sectional view taken along the line BB shown in (a), and (c) is a sectional view taken along line CC shown in (a). It is a figure explaining the construction method of an earthquake-resistant ceiling structure, Comprising: It is a main part side sectional view which showed the joining method of a 1st aluminum extrusion profile and a ceiling board, and the temporary receiving method with a field edge receiver. It is a figure explaining the construction method of an earthquake-resistant ceiling structure, Comprising: It is a main part side sectional view showing the method of fitting into the edge of a field on the same level as a 2nd aluminum extrusion shape, and the method of temporarily receiving with a hanging bolt.

Hereinafter, an earthquake-resistant ceiling structure according to an embodiment of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, the earthquake-resistant ceiling structure 1 according to the present embodiment is used for the ceilings of buildings such as clean rooms, production plants, research facilities, indoor pools, and hot bath facilities that require ceiling sealing. ing. This earthquake-resistant ceiling structure 1 can be applied not only to newly constructed buildings but also to renovation work to make existing buildings earthquake-resistant.

The earthquake-resistant ceiling structure 1 includes a field edge support 2 that is suspended and supported by the upper structure of the building frame via a hanging member 6, a field edge 3 that is attached to the field edge support 2, and a field edge 3 that is attached to the lower surface 3a of the field edge 3. a ceiling panel 4, and a long horizontal force propagation member 5 (5A, 5B) fixed to the upper surface 4b of the ceiling panel 4 directly or via the edge 3 and extending horizontally along the ceiling panel 4. , is equipped with.

The field edge 3 is, for example, a thin steel sheet specified in JIS A 6517, and extends horizontally at a predetermined interval in the first lateral direction A plurality of them are arranged in parallel with space between them (see Fig. 3).

The field edge support 2 is, for example, a thin plate steel material specified in JIS A 6517, and extends horizontally, and has a second lateral direction X2 perpendicular to the first lateral direction X1 in the other horizontal direction (as shown in A plurality of them are arranged in parallel at predetermined intervals in the perpendicular direction (see FIG. 3). The field edge receiver 2 is disposed so as to intersect with the field edge 3, and is placed on a plurality of field edges 3. Each field edge receiver 2 is connected to the field edge 3 at a portion intersecting with the field edge 3 by using a field edge connection fitting (hereinafter referred to as a clip 22).

The hanging member 6 is a hanging bolt that is formed in the shape of a cylindrical rod and has a male thread on the outer circumferential surface, and its upper end is fixed to a superstructure 11 such as flooring on the upper floor or fastened to a steel joist or the like. A plurality of hanging members are connected to the field edge receivers 2 by using seismic hangers 60, which are hanging member connection fittings, at the lower ends. Further, the plurality of hanging members 6 are distributed at predetermined intervals.

The ceiling panel 4 is formed by laminating two boards together, for example, and has a weight of, for example, 30 kg or less per square meter, including the weight of the ceiling equipment and the like. The ceiling panel 4 is installed on the lower surface 3a of the plurality of roof edges 3 by screwing or the like. Note that the ceiling panel 4 may be composed of one board or three or more boards.

In this manner, in the earthquake-resistant ceiling structure 1, the roof edge 3, the roof edge receiver 2, and the ceiling panel 4 are suspended and supported by the building structure (superstructure 11) at the upper part of the ceiling via the hanging members 6. Moreover, a ceiling base 2A is formed by the field edge 3 and the field edge receiver 2, and a ceiling part is formed by the ceiling panel 4 attached to this ceiling base 2A. This ceiling portion forms a ceiling surface 4a.

The building frame 10 in the earthquake-resistant ceiling structure 1 is the main structural parts of the building such as walls, columns, beams, and floors, as shown in FIGS. 1, 2, and 4. In this embodiment, the support beams 13 are integrally joined to the pillar members 12 and arranged at a predetermined height.

A plurality of pillar members 12 may be provided at predetermined intervals in the first lateral direction X1 and the second lateral direction X2. For example, the span of the pillar material 12 can be set to 10 m or more x 10 m or more.

As shown in FIG. 2, the support beam 13 supports the horizontal inertia force generated on the ceiling surface 4a during an earthquake, and is arranged horizontally between the columns 12, 12. A plurality of support beams 13 are provided so as to extend along a first lateral direction X1 and a second lateral direction X2 that are parallel to the field edge 3 and the field edge support 2. As shown in FIGS. 4 and 5, reinforcing ribs 131 whose planes are oriented in a direction perpendicular to the beam length direction are joined to both sides of the web 13A of the support beam 13 at intervals in the length direction.
Further, the support beam 13 is suspended and supported by hanging members 132 supported from the upper structure at predetermined intervals in the beam length direction. By providing the hanging material 132, it is possible to prevent the support beam 13 from deflecting due to its own weight.

As the pillar material 12 and the support beam 13, for example, shaped steel such as H-shaped steel, I-shaped steel, or channel steel, pipe material such as square steel pipe, or reinforced concrete construction can be used. The support beam 13 of this embodiment employs H-section steel, and for example, H-500 x 200 x 10 x 16 steel is arranged horizontally (web 13A is horizontal).

The horizontal force propagation material 5 is a member that propagates the horizontal inertia force acting on the ceiling surface constituent members during an earthquake to the building frame 10, which is a support structure effective in strength and rigidity, near the level of the ceiling surface 4a. The horizontal force propagation member 5 is a substantially rod-shaped tensile member disposed above the ceiling panel 4 so as to extend in the first lateral direction X1 and the second lateral direction X2. The intervals between the horizontal force propagation members 5 in the first lateral direction X1 and the second lateral direction X2 are arranged in a lattice shape with a pitch of, for example, 2500 mm.

As the horizontal force propagation material 5, for example, an aluminum extruded shape, a steel member, a field edge receiving material and a field edge material, etc. can be adopted. A field edge receiving material is adopted as the horizontal force propagation material 5 shown in FIGS. 1 to 4, and the field edge 3 and field edge receiver 2 of the ceiling base 2A described above are provided separately. The horizontal force propagation material 5 made of this edge receiving material is lip channel steel or light channel steel, and has dimensions of, for example, 38 mm in width, 12 mm in height, and 1.2 mm in thickness. The horizontal force propagation members 5, 5 are connected to each other by screws using a connecting plate (not shown).
In addition, although FIG. 4 has shown the joining state of the 1st horizontal force propagation material 5A and the receiving beam 13, the joining state with the receiving beam 13 in the 2nd horizontal force propagation material 5B also has the same structure.

The horizontal force propagation member 5 is connected to the lower end 13a of the support beam 13 via the connecting member 7. As shown in FIG. 4, the connecting member 7 is a rectangular steel plate with a bolt hole formed in the upper part, and is fixed to the reinforcing rib 131 of the support beam 13 by fastening the bolt 71 using the bolt hole. ing. The lower part of the connecting member 7 is fixed to the horizontal force propagating member 5 by a plurality of fixing members 72 such as bolts and screws.

FIG. 5 shows a structure in which a field edge material is used as the horizontal force propagation material 5. A strip-shaped joint plate 73 extending along the longitudinal direction of the horizontal force propagation material 5 is fixed to the horizontal force propagation material 5 with screws. This joining plate 73 and the connecting member 7 fixed to the support beam 13 are fixed by a connecting piece 74. The lower end of the connecting piece 74 is fixed to the upper end of the joint plate 73 via a welding part 75, and the upper part is fixed to the lower part of the connecting member 7 by a bolt 76.
In addition, although FIG. 5 has shown the joining state of 5 A of 1st horizontal force propagation materials, and the receiving beam 13, the joining state of the receiving beam 13 in the 2nd horizontal force propagation material 5B also has the same structure.

Further, as the horizontal force propagating material 5, an extruded aluminum member may be used as shown in FIGS. 6(a) to 6(c) and FIGS. 7(a) to 7(c). Here, in FIGS. 6 and 7, the aluminum extruded shape is indicated by the reference numeral 51.
As shown in FIGS. 6(a) to 6(c), the extruded aluminum member 51 is a long piece having a groove 511 and a reinforcing piece 512 arranged at the center in the height direction inside the groove 511. It is an extruded aluminum alloy material.

The connecting portions of the extruded aluminum profile 51 that are divided at the middle in the extending direction are connected by the connecting hardware 52 with the divided ends 51a and 51a abutted against each other. A plurality of opposing bolt holes are formed in both side walls 513, 513 on the end 51a side of the extruded aluminum member 51 along the extending direction.

The connecting hardware 52 is a groove member that opens downward, and is provided so as to be able to fit outward from the groove opening side of the aluminum extrusion section 51. A plurality of opposing bolt holes are formed in both side walls 521, 521 of the connecting hardware 52 along the extending direction. The respective bolt holes of the aluminum extrusion section 51 and the connecting hardware 52 are arranged at matching positions with the connection hardware 52 being fitted onto the divided aluminum extrusion section 51. Then, by inserting bolts 53 into respective bolt holes of the aluminum extrusion section 51 and the connecting hardware 52 and tightening them with nuts 54, the divided aluminum extrusion sections 51, 51 are connected in the extending direction.

As shown in FIGS. 7(a) to 7(c), the intersections of the first lateral direction X1 and the second lateral direction X2 in the extruded aluminum profile 51 are configured so as not to interfere with each other. One of the first extruded aluminum members 51A (5A) has a lower notch 55 recessed upward from the lower end 51b, and the other second horizontal force propagation member 51B (5B) has an upper notch 55 recessed downward from the upper end 51c. A notch 56 is formed.

The thus formed extruded aluminum sections 51A and 51B, which are orthogonal to each other, have a lower notch 55 in the first extruded aluminum section 51A and an upper notch 56 in the second extruded aluminum section 51B at their intersections. By fitting them vertically, they are arranged in a grid pattern at the same height level. Note that the aluminum extruded shapes 51A and 51B that are fitted at the intersection are not joined, so the tensile force in the axial direction (extending direction) is applied to both ends of the aluminum extruded shapes 51A and 51B. The signal is transmitted to the support beam 13 (see FIGS. 1 and 2) of the building frame 10 through the support beam 13 of the building frame 10.

Here, a design example of the horizontal force propagation material 5 of this embodiment will be explained. In this design example, the above-mentioned aluminum extrusion section 51 is the design target.
First, the horizontal inertia force on the ceiling surface during an earthquake that is borne by one horizontal force propagation material is calculated on the safe side using equation (1).
For example, the maximum design horizontal seismic coefficient (maxK) is 2.2, the maximum design load (maxW) on the ceiling is 30kg/m ² × 9.8N/kg, and the maximum installation interval (controlling width) of horizontal force propagation materials (maxb ) is 10 m, and the maximum distance between fulcrums (maxl) of the horizontal force propagation material is 2.5 m, the maximum tension (maxH) of the horizontal force propagation material is 16170N from equation (1).

As an example, since the F value (standard strength) of aluminum alloy A5083-H112 is 110N/mm ² , the effective cross-sectional area (mm ² ) required for design from the result of equation (1) above is as follows. Become.
Aluminum alloy A5083-H112: 16170N/110N/mm ² = 147mm ²
When lightweight section steel is used, the F value of the plated thin steel sheet SPCC used as the material is 205 N/mm ² , so from the result of equation (1) above, the effective cross-sectional area (mm ² ) required for design is as follows: It will be as follows.
Plated thin steel plate SPCC: 16170N/205N/mm ² = 79mm ²

In addition, in order to directly transmit the horizontal inertia of the ceiling surface components to the horizontal force propagation material, when directly bonding to the ceiling plate, use an aluminum alloy that can be bonded with board screws, a steel plate with a thickness of 1.2 mm or less, or an edge. In the case of joining through a wire, the border materials and joining hardware must be able to bear the load.
In the case of a plan using extruded aluminum, by designing with a thickness of 25 mm, it is possible to design using conventional construction methods such as no-edge and no-edge supports, which are commonly used as ceiling base materials other than horizontal force propagation members. becomes possible. In addition, the horizontal force transmission member is shaped so that it can be attached to the field fence with commercially available clips, and can be directly supported with hanging bolts, making it possible to provide temporary support during construction, making construction easier. be able to.

Next, a method for constructing the horizontal force propagation material 5 will be described in detail based on FIGS. 8, 9, and the like.
Here, as the horizontal force propagation material 5, aluminum extrusion sections 51 (51A, 51B) will be used for explanation.

First, as shown in FIG. 8, the field edge receiver 2 is supported by an earthquake-resistant hanger 60 on the hanging member 6, and the field edge 3 is supported on the lower surface 2a of the field edge receiver 2 by a first earthquake-resistant clip 21.
Next, in this state, on the lower side of the field edge receiver 2, a second aluminum extruded shape 51B is formed so as to extend in a second lateral direction X2 perpendicular to the field edge receiver 2 (direction parallel to the field edge 3). is temporarily accepted. Specifically, the first seismic clip 21 is used on the lower surface 2a of the field edge support 2 to support the second aluminum extrusion section 51B.
Note that the first earthquake-resistant clip 21 may be, for example, a claw clip or the like, and may be a clip that can be attached to and detached from the second extruded aluminum section 51B. This makes it easier to release the second aluminum extrusion section 51B from the temporary receiving state on the field edge receiver 2.

Further, as shown in FIG. 9, in the same height position as the second extruded aluminum profile 51B (see FIG. 8) temporarily received by the field edge receiver 2 described above, in the extending direction of the field edge receiver 2 (first The first aluminum extrusion section 51A is suspended and temporarily supported by temporary suspension bolts 61 so as to extend along the lateral direction X1). Specifically, bolts 63, 63 are provided on the first aluminum extrusion section 51A and the lower end 61a of the hanging bolt 61, respectively, and a turnbuckle 62 is connected between the upper and lower bolts 63, 63. By rotating the turnbuckle 62, the height of the first extruded aluminum member 51A can be adjusted.
Here, the interference portion of the edge 3 extending in the second lateral direction X2 that interferes with the first aluminum extrusion section 51A is cut off.

Note that either the first extruded aluminum member 51A or the second extruded aluminum member 51B may be temporarily received first, or may be temporarily received at the same time. However, as shown in FIGS. 7(a) to 7(c), when both are temporarily received at the same height, an intersection occurs, so either one of the first lateral direction X1 and the second lateral direction It is preferable that only the aluminum extruded sections 51 arranged in the direction are temporarily received first, and then the aluminum extruded sections 51 arranged in the other direction are temporarily received.

Next, as shown in FIG. 1, both ends of the first extruded aluminum profile 51A and the second extruded aluminum profile 51B, which have been temporarily supported, are joined to the lower surface 13a of the support beam 13 of the building frame (Fig. 1 and Figure 2).

After fixing the first extruded aluminum profile 51A and the second extruded aluminum profile 51B to the support beam 13, the ceiling board is fastened. Both the first aluminum extrusion section 51A and the second aluminum extrusion section 51B are joined to the ceiling board at a pitch of 100 mm or less using screws with a nominal diameter of 3.5 mm or more. At that time, the first aluminum extrusion section 51A is removed from the first earthquake-resistant clip 21 to release the temporary support from the field edge support 2. Note that if the temporary support between the first aluminum extrusion member 51A and the field edge support 2 is not in a tight state, it may be in a state where it is not released.

Next, the operation of the earthquake-resistant ceiling structure described above will be explained in detail based on the drawings.
In this embodiment, as shown in FIGS. 1 and 2, the horizontal force propagation material 5 arranged on the upper surface side of the ceiling panel 4 is arranged to extend in the horizontal direction, and both ends of the horizontal force propagation material 5 are arranged so as to extend in the horizontal direction. It is possible to realize a ceiling structure with high load-bearing rigidity, in which the section is joined to the support beam 13, which is a support structure section that behaves integrally with the building frame 10. Therefore, in the event of an earthquake, the ceiling section having the ceiling panel 4 fixed to the lower surface side of the horizontal force propagation material 5 moves in the horizontal direction together with the building frame 10, and the ceiling section Collision with other structures can be prevented.

Furthermore, in this embodiment, as described above, the ceiling section moves horizontally together with the building frame 10, so there is no need to provide a horizontal clearance between the ceiling surface 4a and the building frame 10. Therefore, it can be applied to buildings that require airtightness, such as clean rooms, indoor pools, and hot bath facilities.
Furthermore, in this embodiment, the horizontal force propagation material 5 is arranged above the ceiling panel 4 in the ceiling, and no earthquake-resistant member is arranged on the ceiling surface 4a (lower surface of the ceiling panel). The earthquake-resistant member having an uneven shape is not exposed, and the design is not deteriorated.

In addition, in this embodiment, in the event of an earthquake, the horizontal force acting on the ceiling is transferred to the building frame by the first horizontal force propagating member 5A, the second horizontal force propagating member 5B and the support beam 13 arranged in two directions in a grid pattern. 10. Therefore, the ceiling section moves horizontally in unison with the building frame 10 more reliably, and amplification of shaking of the ceiling section can be suppressed.

Moreover, in this embodiment, the other horizontal force propagation material 5 fits into the notch recess of one of the first horizontal force propagation material 5A and the second horizontal force propagation material 5B, so that the first horizontal force propagation material 5A and the second horizontal force propagation material 5B can intersect at the same height position.
Therefore, the height of the horizontal force propagation materials 5 arranged in a lattice pattern can be kept to the height of the 25 mm edge material of the conventional construction method that is generally distributed, and the height of the ceiling space can be reduced. Increase can be suppressed.

Further, in this embodiment, the ends of the horizontal force propagation member 5 can be coaxially connected in the extension direction with the ends of the horizontal force propagation member 5 butted against each other using the connecting hardware. As a result, a plurality of horizontal force propagation members 5 can be provided integrally, and even if the horizontal span of the support beam 13 is large, the horizontal force acting on the ceiling can be efficiently transmitted by the plurality of horizontal force propagation members 5. It can be propagated to the receiving beam 13.

As described above, the earthquake-resistant ceiling structure according to the present embodiment can realize a ceiling structure with high strength and rigidity, and can also eliminate the need for ceiling clearance because it follows the deformation of the building frame.
In addition, in this embodiment, in addition to the ceiling base material using conventional construction methods, the structure is such that earthquake-resistant materials with a small cross section at the same height as the field edge materials are installed horizontally at the same height level as the field edge materials. Therefore, interference can be avoided even in areas with many facilities under the ceiling, and there is no need to increase the floor height or lower the ceiling surface to install large earthquake-resistant members.

Although the embodiments of the earthquake-resistant ceiling structure according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit thereof.

For example, in this embodiment, the horizontal force propagation members 5A and 5B are arranged in a grid pattern in two directions perpendicular to each other; It is not limited to that. In short, the horizontal force propagation material 5 only needs to be a long member that extends horizontally along the ceiling panel 4.

Further, in this embodiment, the first horizontal force propagation member 5A and the second horizontal force propagation member 5B extending in two directions are arranged at the same height, but both horizontal force propagation members 5A, 5B are not limited to being at the same height level, but may be placed at vertically shifted positions.
For example, as shown in FIGS. 1 to 5, the horizontal force propagation material 5A may be placed at the height of the field edge receiver, and the horizontal force propagation material 5B may be placed at the height of the field edge. In this case, since they are arranged at vertically shifted positions, there is no need to form a cutout recess at the intersection for fitting.

Furthermore, when the first horizontal force propagation material 5A and the second horizontal force propagation material 5B are arranged at the same height, the structure of the mutually intersecting portion is arranged in a direction orthogonal to at least one of the horizontal force propagation materials 5 mentioned above. A notch opening is formed in the cross section, and the other horizontal force propagation member 5 is fitted into the notch recess so as to be movable in the extending direction, thereby forming an intersection. However, the present invention is not limited to such a configuration. It never happens.

In addition, although the split ends of the horizontal force propagation member 5 in the middle part in the extending direction are butted against each other and connected by the connecting hardware 52, the structure is not limited to this, and the connecting hardware 52 is used. It is also possible to adopt a connection structure that does not.

Further, in this embodiment, the horizontal force propagation member 5 is configured to be joined to the support beam 13 made of H-section steel, but it is not limited to the support beam 13. For example, the support structure may be a support beam made of a square steel pipe or a support beam made of reinforced concrete. Furthermore, the joining portion of the horizontal force propagation material 5 is not limited to a beam material, and for example, the horizontal force propagation material 5 may be joined to a pillar material 12 that is a building frame.

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the spirit of the present invention.

1 Earthquake-resistant ceiling structure 2 Edge support 2A Ceiling base 3 Edge 4 Ceiling panel 4a Ceiling surface 5 Horizontal force propagation material 5A First horizontal force propagation material 5B Second horizontal force propagation material 6 Hanging member 7 Connecting material 10 Building frame 11 Upper part Structure 12 Column material 13 Support beam (support structure part)
51, 51A, 51B Aluminum extrusion shape 52 Connection hardware X1 First lateral direction X2 Second lateral direction

Claims (4)

a field support that is suspended and supported by the upper structure of the building frame via a hanging member;
a field edge attached to the field edge receiver;
An earthquake-resistant ceiling structure comprising: a ceiling panel attached to the lower surface of the veranda;
An elongated horizontal force propagation member is provided that is fixed to the upper surface of the ceiling panel directly or via the edge and extends horizontally along the ceiling panel,
The horizontal force propagation material is
They are arranged with their extension directions pointing in two different directions,
The first horizontal force propagation member and the second horizontal force propagation member extending in two directions are arranged at the same height,
At the intersection of the first horizontal force propagating material and the second horizontal force propagating material, a cutout recess that opens in the vertical direction with respect to at least one horizontal force propagating material is formed,
An earthquake-resistant ceiling structure characterized in that the other horizontal force propagation member is fitted into the cutout recess so that the other horizontal force propagation member can move in the extending direction of the other horizontal force propagation member. The earthquake-resistant ceiling structure according to claim 1, wherein the horizontal force propagation materials are arranged in a lattice shape with extending directions in two directions perpendicular to each other. The earthquake-resistant ceiling structure according to claim 1 or 2, wherein the horizontal force propagation material is divided at an intermediate portion in the extending direction, and the divided ends are butted against each other and connected by connecting hardware. . The earthquake-resistant ceiling structure according to any one of claims 1 to 3, wherein the horizontal force propagation material is constituted by a combination of a field edge receiving material and a field edge material.

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