JP2021080740A - Ceiling structure of unit building - Google Patents

Abstract

To provide a ceiling structure of a unit building capable of setting a part with high ceiling height in a range across a plurality of building units and capable of securing structural resistance of a skeleton of a building unit.SOLUTION: A ceiling girder 26 constituting a part of an outer peripheral portion at a building upper side portion of frames 18, 52 includes: a general portion 42 constituting both end portions in its longer direction; and a joining portion 46 disposed at a center side in the longer direction and joining the general portions 42 with each other. As to the joining portion 46, a beam depth is set smaller than that of the general portion 42, and a bottom face portion 50C of a pipe material 50 constituting the joining portion 46 is disposed above a bottom face portion 42F of the general portion 42 in a height direction. Thus, a part with high ceiling height can be set in a boundary of a building unit 12 and a building unit 14.SELECTED DRAWING: Figure 2

Description

The present invention relates to a ceiling structure of a unit building.

The following Patent Document 1 discloses an invention relating to a unit building. In this unit building, in an adjacent building unit, the ceiling frame of one building unit is provided with a U-shaped portion open to the other building unit side when viewed from the building height direction. Further, the ceiling frame of the other building unit is provided with a U-shaped portion open to one building unit side when viewed from the building height direction. Then, by combining the U-shaped portion provided on the ceiling frame of one building unit and the U-shaped portion provided on the ceiling frame of the other building unit, the skeleton of the unit building can be formed. A rectangular frame-shaped part is formed when viewed from the height direction of the building. Therefore, in the prior art described in Patent Document 1 below, a portion having a high ceiling height in the unit building can be set in a range covered by a plurality of building units.

Japanese Unexamined Patent Publication No. 11-172771

However, in the prior art described in Patent Document 1, although the rectangular frame-shaped portion provided on the frame of the unit building is reinforced by the load-bearing frame, as described above, the ceiling frame of the building unit is the same. Part of it is open. For this reason, it may be difficult to secure the structural strength of the building unit itself.

In consideration of the above facts, the present invention obtains a ceiling structure of a unit building capable of setting a portion having a high ceiling height within a range applicable to a plurality of building units and ensuring the structural strength of the skeleton of the building unit. Is the purpose.

The ceiling structure of the unit building according to the first aspect is provided for each of the building units on the boundary side between adjacent building units, and is one of the outer peripheral portions of the upper part of the building in the frame of the building unit. The general part that constitutes the part and constitutes both ends in the longitudinal direction and the general part that is arranged on the central side in the longitudinal direction to connect the general parts, the beam ceiling is set smaller than the general part, and the bottom part is the general part. It has a constricted ceiling beam configured including a connecting portion arranged above the bottom surface portion of the building in the height direction of the building.

In the ceiling structure of the unit building according to the first aspect, a constricted ceiling beam is provided for each of the building units on the boundary side between adjacent building units. This constricted ceiling beam constitutes a part of the outer peripheral portion of the upper part of the building in the frame of the building unit.

By the way, when setting a portion having a high ceiling height in a unit building to cover a plurality of building units, it is conceivable to omit a part of the outer peripheral portion of the upper portion of the building in the frame of the building unit. However, if such a configuration is applied, it may be difficult to secure the structural strength of the skeleton of the building unit.

Here, in the present aspect, the constricted ceiling beam is configured to include a general portion forming both end portions in the longitudinal direction thereof and a connecting portion arranged on the central side in the longitudinal direction to connect the general portions. .. The connecting portion has a smaller beam than the general portion and the bottom surface portion is arranged above the bottom surface portion of the general portion in the building height direction.

Therefore, a portion having a high ceiling height can be set at the boundary between adjacent building units. Further, since the outer peripheral portion of the upper part of the building unit frame is a continuous structure, the vertical force and the horizontal force acting on the unit building can be supported by the entire outer peripheral portion. ..

The ceiling structure of the unit building according to the second aspect is the ceiling structure of the unit building according to the first aspect, wherein the general portion and the connecting portion are formed as separate bodies, and the connecting portion of the general portion is formed. A mounting plate portion having a mounting surface portion facing the connecting portion side is provided at the end portion on the portion side, and the end portion of the connecting portion is joined to the mounting surface portion.

In the ceiling structure of the unit building according to the second aspect, the general portion and the connecting portion of the constricted ceiling beam are formed as separate bodies. A mounting plate portion having a mounting surface portion facing the connecting portion side is provided at the end portion of the general portion on the connecting portion side, and the end portion of the connecting portion is joined to the mounting surface portion. .. For this reason, it is easier to change the shape and material of the connecting part according to the ceiling height required for the unit building and the structural strength required for the building unit, as compared with the configuration in which the general part and the connecting part are integrated. It becomes.

The ceiling structure of the unit building according to the third aspect is the ceiling structure of the unit building according to the second aspect. It further has a load transmitting portion capable of transmitting a load from the portion to the flange portion.

In the ceiling structure of the unit building according to the third aspect, the load acting on the connecting portion of the confined ceiling beam is transmitted to the general portion of the confined ceiling beam via the mounting plate portion and is supported by the general portion.

The ceiling structure of the unit building according to the fourth aspect is the ceiling structure of the unit building according to the second aspect or the third aspect. It is composed of a plurality of pipe materials adjacent to each other in a direction orthogonal to the longitudinal direction when viewed from the direction.

In the ceiling structure of the unit building according to the fourth aspect, the connecting portion is composed of a plurality of pipe materials, and these pipe materials extend in the longitudinal direction of the constricted ceiling beam and are in the longitudinal direction when viewed from the longitudinal direction. Adjacent to the direction orthogonal to.

By the way, in a configuration in which the joint portion is composed of one pipe material and the beam length of the joint portion is reduced, in order to secure the flexural rigidity of the joint portion, the plate thickness of the pipe material may be set thick. , It is necessary to increase the strength of the material of the pipe material. However, it is not preferable from the viewpoint of cost and the like to adopt a pipe material that satisfies the above conditions as the pipe material constituting the connecting portion.

Here, in the present embodiment, as described above, since the connecting portion is composed of a plurality of pipe materials adjacent to each other in the direction orthogonal to the longitudinal direction of the constricted ceiling beam, the strength of the pipe material or material having a thin plate thickness at the connecting portion. Even if a low-profile pipe material is used, it is easy to secure the bending rigidity of the joint.

The ceiling structure of the unit building according to the fifth aspect is the ceiling structure of the unit building according to the fourth aspect, wherein the plurality of pipe materials have a rectangular cross section when viewed from the longitudinal direction of the constricted ceiling beam. , It is arranged adjacent to the direction orthogonal to the building height direction when viewed from the longitudinal direction.

In the ceiling structure of the unit building according to the fifth aspect, the cross sections of the plurality of pipe materials constituting the connecting portion of the confined ceiling beams when viewed from the longitudinal direction are rectangular. Further, these pipe materials are arranged adjacent to each other in a direction orthogonal to the building height direction when viewed from the longitudinal direction of the confined ceiling beam.

For this reason, the cross section of the plurality of pipe materials when viewed from the longitudinal direction of the constricted ceiling beam is rectangular, and these pipe materials are arranged adjacent to each other in the building height direction when viewed from the longitudinal direction. However, it becomes easier to secure the flexural rigidity of the joint with respect to the load in the height direction of the building.

The ceiling structure of the unit building according to the sixth aspect is the same as the first ceiling material attached to the general portion in the ceiling structure of the unit building according to any one of the first to fifth aspects. Further, it has a second ceiling material attached to the connecting portion.

In the ceiling structure of the unit building according to the sixth aspect, the first ceiling material is attached to the general portion of the confined ceiling beam, and the second ceiling material is attached to the connecting portion of the confined ceiling beam. .. Therefore, a folded ceiling can be provided in a range covering a plurality of building units.

The ceiling structure of the unit building according to the seventh aspect is the ceiling structure of the unit building according to the sixth aspect, and the constricted ceiling beams are the building units arranged in a row in the first direction. It is arranged on the boundary side between the building units adjacent to each other in the first direction.

In the ceiling structure of the unit building according to the seventh aspect, a folded ceiling can be provided in a range covering three or more building units.

As described above, in the ceiling structure of the unit building according to the first aspect, the portion having a high ceiling height can be set in a range that covers a plurality of building units, and the structural strength of the skeleton of the building unit is ensured. It has the excellent effect of being able to.

In the ceiling structure of the unit building according to the second aspect, it is possible to easily design the skeleton of the building unit according to the ceiling height required for the unit building and the structural strength required for the building unit. Has an excellent effect.

The ceiling structure of the unit building according to the third aspect has an excellent effect that it is possible to suppress the occurrence of stress concentration points in the skeleton of the building unit.

The ceiling structure of the unit building according to the fourth aspect has an excellent effect that the cost can be reduced while ensuring the structural strength of the skeleton of the building unit.

The ceiling structure of the unit building according to the fifth aspect has an excellent effect that the skeleton of the building unit can be made difficult to be deformed by a force in the height direction of the building.

The ceiling structure of the unit building according to the sixth aspect has an excellent effect that a feeling of openness in the room can be produced.

The ceiling structure of the unit building according to the seventh aspect has an excellent effect that a folded ceiling can be provided in a wide range of the ceiling.

It is a perspective view (one-way arrow view of FIG. 3) which shows the structure of the constricted ceiling beam of a unit building to which the ceiling structure of the unit building which concerns on 1st Embodiment is applied. Cross-sectional view showing the configuration of the boundary between adjacent building units of the unit building to which the ceiling structure of the unit building according to the first embodiment is applied (cross-sectional view showing a state of being cut along line 2-2 of FIG. 4). ). It is a perspective view which shows typically the structure of the skeleton of a building unit in the unit building to which the ceiling structure of the unit building which concerns on 1st Embodiment is applied. It is a top view which shows the structure of the skeleton of a unit building in the unit building to which the ceiling structure of the unit building which concerns on 1st Embodiment is applied. It is a perspective view which shows the structure of the ceiling part in the unit building to which the ceiling structure of the unit building which concerns on 1st Embodiment is applied. It is sectional drawing which shows the structure of the modification of the joint part in the unit building to which the ceiling structure of the unit building which concerns on 1st Embodiment is applied, (A) shows the 1st modification, (B) is A second modification is shown. It is a side view which shows the structure of the load transmission part in the unit building to which the ceiling structure of the unit building which concerns on 2nd Embodiment is applied. It is a side view which shows the structure of the modification of the load transmission part in the unit building to which the ceiling structure of the unit building which concerns on 2nd Embodiment is applied. It is a side view which shows the structure of the constricted ceiling beam in the unit building to which the ceiling structure of the unit building which concerns on 3rd Embodiment is applied.

<First Embodiment>
Hereinafter, the ceiling structure of the unit building according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 6. First, the overall structure of the “building 10” as a unit building to which the ceiling structure of the unit building according to the present embodiment is applied will be described mainly with reference to FIG.

The building 10 includes a foundation (not shown) and a plurality of "building units 12, 14, 16" arranged in a row in the first direction on the upper side of the foundation in the building height direction. Further, the building units 12, 14 and 16 are arranged so that the second direction orthogonal to the first direction when viewed from the building height direction is the longitudinal direction. In each figure, the girder direction of the building 10 (hereinafter referred to as the girder direction) is indicated by an arrow X, the beam-to-beam direction of the building 10 (hereinafter referred to as the beam-to-beam direction) is indicated by an arrow Y, and the height direction of the building 10. (Hereinafter referred to as the height direction) is indicated by an arrow Z. Further, the above-mentioned first direction is the same direction as the girder direction, and the above-mentioned second direction is the same direction as the beam-to-beam direction.

Since the building units 12, 14 and 16 have basically the same configuration, the description will be continued by taking the building unit 12 arranged in the center in the girder direction as an example. As shown in FIG. 3, the building unit 12 includes a "frame 18" as a skeleton, and the frame 18 is a ceiling frame 20 forming an upper portion in the height direction and a lower side in the height direction thereof. The floor frame 22 and the four pillars 24 that form the portion of the above are included.

Specifically, the ceiling frame 20 includes a pair of "ceiling girders 26" as constricted ceiling beams and a pair of ceiling girders 28 set to a length shorter than the ceiling girders 26 and made of channel steel. .. The ceiling girders 26 and 28 are arranged in a rectangular frame shape, and the end portion of the ceiling girder 26 and the end portion of the ceiling girder 28 are connected by a square tubular joint portion 30 extending in the height direction. The outer peripheral portion of the ceiling frame 20 is configured. A plurality of ceiling beams 32 are bridged between the ceiling beams 26 at predetermined intervals.

On the other hand, in the floor frame 22, two types of long and short floor girders 34 and 36 each made of channel steel are arranged in a rectangular frame shape, and the end portion of the floor girder 34 and the end portion of the floor girder 36 are high. The outer frame is formed by being connected by a square tubular joint 38 extending in the longitudinal direction. A plurality of floor beams 40 are bridged between the floor beams 34 at predetermined intervals.

The pillar 24 has a tubular shape having a rectangular cross-sectional shape when viewed from the building height direction, and connects the joint portion 30 and the joint portion 38 facing each other in the building height direction.

Here, in the present embodiment, as shown in FIG. 1, the ceiling girder 26 includes a pair of "general portions 42", a pair of "mounting plate portions 44", and a "connecting portion 46". It is characterized by the fact that it is. Hereinafter, the configuration of the ceiling girder 26 will be described in detail.

Each of the pair of general portions 42 constitutes an end portion of the ceiling girder 26, and is made of channel steel like the ceiling girder 28. More specifically, the general portion 42 includes a "flange portion 42A" that constitutes an upper portion in the height direction, a flange portion 42B that constitutes a lower portion in the height direction, and a flange portion 42A and a flange portion 42B. It is configured to include a web portion 42C that connects the two to the outside of the building unit 12.

A support plate portion 48 is provided at a predetermined distance from the end portion 42D (on the central side in the longitudinal direction of the ceiling girder 26) on one side in the beam-to-beam direction of the general portion 42, and the support plate portion 48 is provided. The end of the ceiling beam 32 is joined by a joint (not shown) by welding or the like.

The mounting plate portion 44 is arranged at the end portion 42D of the general portion 42, and is made of a steel plate material that fits in the inner circumference of the general portion 42 when viewed from the beam-to-beam direction, and the outer peripheral edge portion of the building unit 12 is formed. It is joined to the inner peripheral surface of the general portion 42 by a joint portion (not shown) by welding or the like. A connecting portion 46 is attached to the "flat surface portion 44A" as the mounting surface portion on one side in the beam-to-beam direction of the mounting plate portion 44.

The connecting portion 46 is configured to include two steel "pipe members 50", and these pipe members 50 extend in the beam-to-beam direction and are arranged adjacent to each other in the girder direction. The pipe material 50 has a rectangular cross section when viewed from the beam-to-beam direction, and its "end portion 50A" is joined to the flat surface portion 44A at a joint portion (not shown) by welding or the like. It should be noted that the rectangular shape referred to here includes a configuration in which the corners are arcuate and the like is not a perfect rectangular shape. Then, the end portion of the ceiling beam 32 is joined to the pipe material 50 arranged inside the building unit 12 by a joint portion (not shown) by welding or the like.

Further, as shown in FIG. 2, the length of the pipe material 50 in the height direction is set to about one-fourth to one-third of the length of the general portion 42 in the height direction. There is. That is, the ceiling girder 26 is set so that the beam length of the connecting portion 46 is smaller than that of the general portion 42. In other words, the ceiling girder 26 is in a constricted state on the central side in the longitudinal direction.

The height of the upper surface portion 50B of the pipe material 50 coincides with the height of the upper surface portion 42E of the general portion 42, and the “bottom surface portion 50C” of the pipe material 50 is higher than the “bottom surface portion 42F” of the general portion 42. It is located on the upper side in the vertical direction.

Further, the length of the pipe material 50 in the inter-beam direction is set to about 70 to 80% of the length of the ceiling girder 26 in the inter-beam direction as an example.

As shown in FIG. 4, the ceiling girder 26 is attached to the portion of the ceiling frame 54 of the “frame 52” as the skeleton of the building unit 14 arranged on one side in the girder direction of the building unit 12 on the building unit 12 side. It is provided. Further, the ceiling girder 26 is also provided on the portion of the ceiling frame 58 of the “frame 56” as the skeleton of the building unit 16 arranged on the other side in the girder direction of the building unit 12 on the building unit 12 side.

Then, as shown in FIG. 2, at the boundary between the building unit 12 and the building unit 14, "ceiling materials 60 and 62" as the first ceiling material and "ceiling materials 64 and 66" as the second ceiling material are formed. "Is placed.

Specifically, in the ceiling girder 26 of the building unit 12, two ceiling materials 60 are arranged on the lower side in the height direction of the inner portion of the flange portion 42B of the general portion 42 in the height direction. The ceiling material 60 has a plate shape with the plate thickness direction in the height direction, and is flanged by a nail 70 (mounting member) in a state of being stacked in the height direction and via a base material 68. It is attached to 42B.

Further, the ceiling material 60 and the base material 68 are also attached to the inner portion of the building unit 14 in the flange portion 42B of the ceiling girder 26 of the building unit 14, similarly to the building unit 12.

On the other hand, two ceiling materials 62 are on the lower side in the height direction of the outer portion of the building unit 12 in the flange portion 42B on the building unit 12 side and the outer portion of the building unit 14 in the flange portion 42B on the building unit 14 side. Is placed.

The ceiling material 62 has a plate shape with the plate thickness direction in the height direction, and is flanged by a nail 72 (mounting member) in a state of being stacked in the height direction and via a base material 68. It is attached to 42B. That is, the ceiling material 62 is arranged at the boundary between the building unit 12 and the building unit 14.

On the other hand, two ceiling members 64 are arranged on the lower side in the height direction of the pipe member 50 inside the building unit 12 at the connecting portion 46 of the building unit 12. The ceiling material 64 has a plate shape with the plate thickness direction in the height direction, and the pipe material 50 is provided by the nail 76 (mounting member) in a state of being stacked in the height direction and via a base material 74. It is attached to.

Further, the ceiling material 64 and the base material 74 are also attached to the pipe material 50 inside the building unit 14 at the connecting portion 46 of the building unit 14, similarly to the building unit 12.

On the other hand, two ceilings are on the lower side in the height direction of the pipe material 50 outside the building unit 12 at the connecting portion 46 on the building unit 12 side and the pipe material 50 outside the building unit 14 at the connecting portion 46 on the building unit 14 side. The material 66 is arranged.

The ceiling material 66 has a plate shape with the plate thickness direction in the height direction, and the pipe material 50 is provided by the nail 78 (mounting member) in a state of being stacked in the height direction and via a base material 74. It is attached to. That is, the ceiling material 66 is arranged at the boundary between the building unit 12 and the building unit 14.

At the boundary between the building unit 12 and the building unit 16, ceiling materials 60, 62, 64, and 66 are provided as well as the boundary between the building unit 12 and the building unit 14.

Then, by arranging the ceiling materials 60, 62, 64, 66 as described above, the building 10 has a range extending over the building units 12, 14, 16 as shown in FIGS. 4 and 5. A folded ceiling 80 is provided. The ceiling material 82 constituting the peripheral wall portion of the folded ceiling 80 is attached to the mounting plate portion 44 and the ceiling beam 32 via a base material (not shown) or a mounting bracket (not shown).

<Action and effect of this embodiment>
Next, the operation and effect of this embodiment will be described.

In the present embodiment, as shown in FIG. 4, ceiling girders 26 are provided for each of the building units 12 and 14 on the boundary side between the adjacent building unit 12 and the building unit 14. Further, ceiling girders 26 are provided for each of the building units 12 and 16 on the boundary side between the adjacent building unit 12 and the building unit 16. The ceiling girder 26 constitutes a part of the outer peripheral portion of the upper portion of the building in the frames 18, 52, and 56.

By the way, when setting the portion of the building 10 having a high ceiling height to cover the building units 12, 14 and 16, it is conceivable to omit a part of the outer peripheral portion of the upper portion of the building in the frames 18, 52 and 56. Be done. However, if such a configuration is applied, it may be difficult to secure the structural strength of the frames 18, 52, and 56.

Here, in the present embodiment, as shown in FIG. 1, the ceiling girder 26 connects the general portions 42 forming both ends in the longitudinal direction thereof and the general portions 42 arranged on the central side in the longitudinal direction thereof. It is configured to include a connecting portion 46. The connecting portion 46 is set to have a smaller beam length than the general portion 42, and the bottom surface portion 50C of the pipe material 50 constituting the connecting portion 46 is arranged above the bottom surface portion 42F of the general portion 42 in the height direction. Has been done.

Therefore, a portion having a high ceiling height can be set at the boundary portion between the building unit 12 and the building unit 14 and the boundary portion between the building unit 12 and the building unit 16. Further, since the outer peripheral portion of the upper part of the building in the frames 18, 52, 56 is a continuous structure, the vertical force or the horizontal force acting on the building units 12, 14, 16 is applied to the outer peripheral portion. Can be supported as a whole.

Therefore, in the building 10 according to the present embodiment, the portion having a high ceiling height can be set in the range covering the building units 12, 14 and 16, and the structural strength of the frames 18, 52 and 56 can be secured. ..

Further, in the present embodiment, the general portion 42 and the connecting portion 46 of the ceiling girder 26 are formed as separate bodies. A mounting plate portion 44 having a flat surface portion 44A facing the connecting portion 46 side is provided at the end portion of the general portion 42 on the connecting portion 46 side, and the end portion 50A of the connecting portion 46 is the flat surface portion 44A. It is joined to. Therefore, compared to the configuration in which the general portion 42 and the connecting portion 46 are integrated, the shape of the connecting portion 46 and the shape of the connecting portion 46 are determined according to the ceiling height required for the building 10 and the structural strength required for the building units 12, 14 and 16. It becomes easy to change the material and the like.

Therefore, in the present embodiment, it is possible to easily design the frames 18, 52, 56 according to the ceiling height required for the building 10 and the structural strength required for the building units 12, 14, 16. ..

Further, in the present embodiment, the connecting portion 46 is composed of a plurality of pipe materials 50, and these pipe materials 50 extend in the longitudinal direction of the ceiling girder 26 and are orthogonal to the longitudinal direction when viewed from the longitudinal direction. Adjacent to the direction.

By the way, in a configuration in which the connecting portion 46 is composed of one pipe material and the beam length of the connecting portion 46 is reduced, in order to secure the bending rigidity of the connecting portion 46, the plate thickness of the pipe material is set to be thick. Alternatively, it is necessary to increase the strength of the material of the pipe material. However, it is not preferable from the viewpoint of cost and the like to adopt a pipe material satisfying the above conditions as the pipe material constituting the connecting portion 46.

Here, in the present embodiment, as described above, since the connecting portion 46 is composed of a plurality of pipe materials 50 adjacent to each other in the direction orthogonal to the longitudinal direction of the constricted ceiling beam, the connecting portion 46 has a thin plate thickness. Even if a pipe material having a low strength is used, it is easy to secure the bending rigidity of the connecting portion 46. Therefore, in the present embodiment, the cost can be reduced while ensuring the structural strength of the frames 18, 52, and 56.

Further, in the present embodiment, the cross sections of the plurality of pipe members 50 constituting the connecting portion 46 when viewed from the longitudinal direction of the ceiling girder 26 are rectangular. Further, these pipe members 50 are arranged adjacent to each other in a direction orthogonal to the height direction when viewed from the longitudinal direction of the ceiling girder 26.

For this reason, the cross sections of the ceiling girders 26 in the plurality of pipe materials when viewed from the longitudinal direction are made rectangular, and these pipe materials are arranged adjacent to each other in the height direction when viewed from the longitudinal direction. , It becomes easy to secure the bending rigidity of the connecting portion 46 with respect to the load in the height direction. Therefore, in the present embodiment, the frames 18, 52, and 56 can be made difficult to be deformed with respect to the force in the height direction.

Further, in the present embodiment, as shown in FIG. 2, the ceiling materials 60 and 62 are attached to the general portion 42 of the ceiling girder 26, and the ceiling material 64, to the connecting portion 46 of the ceiling girder 26. 66 is attached. Therefore, as shown in FIGS. 4 and 5, the folded ceiling 80 can be provided in the range covering the building units 12, 14 and 16. Therefore, in the building 10 according to the present embodiment, it is possible to produce a feeling of openness in the room.

In addition, in the present embodiment, since the folded ceiling 80 can be provided in the range covering the three building units 12, 14 and 16, the folded ceiling 80 can be provided in a wide range of the ceiling of the building 10.

In the present embodiment, as shown in FIG. 6A, the two pipe members 50 are arranged adjacent to each other in the height direction when viewed from the longitudinal direction of the ceiling girder 26 to form the connecting portion 46. You may. According to such a configuration, it becomes easy to secure the bending rigidity of the connecting portion 46 with respect to the load in the horizontal direction input to the building 10.

Further, in the present embodiment, as shown in FIG. 6B, the cross-sectional shape of the ceiling girder 26 of the pipe material 50 as viewed from the longitudinal direction may be circular, depending on the configuration around the connecting portion 46 and the like.

<Second Embodiment>
Hereinafter, the ceiling structure of the unit building according to the second embodiment of the present invention will be described with reference to FIGS. 7 and 8. The same components as those in the first embodiment described above will be assigned the same numbers, and the description thereof will be omitted.

As shown in FIG. 7, the ceiling structure of the unit building according to the present embodiment includes a steel “load transmission unit 90” capable of transmitting a load from the mounting plate portion 44 to the flange portion 42A of the general portion 42. It is characterized by being there.

Specifically, the load transmitting portion 90 includes the vertical plate portion 90A and the horizontal plate portion 90B, and has a plate shape that is bent in an L shape when viewed from the girder direction. Specifically, the vertical plate portion 90A has a plate-like shape in which the plate thickness direction is the beam-to-beam direction and is accommodated inside the connecting portion 46 when viewed from the beam-to-beam direction, and is opposite to the connecting portion 46 in the mounting plate portion 44. It is joined to the surface at a joint (not shown) by welding or the like.

On the other hand, the horizontal plate portion 90B has a plate shape with the plate thickness direction in the height direction, and extends from the upper peripheral portion in the height direction of the vertical plate portion 90A to the side opposite to the connecting portion 46. It is joined to the flange portion 42A at a joint portion (not shown) by welding or the like.

According to such a configuration, the load acting on the connecting portion 46 of the ceiling girder 26 is transmitted to the general portion 42 of the ceiling girder 26 via the mounting plate portion 44 and is supported by the general portion 42. Therefore, in the present embodiment, it is possible to suppress the occurrence of stress concentration points on the frames 18, 52, and 56.

In the present embodiment, as shown in FIG. 8, the load transmitting portion 90 may be provided with a reinforcing plate 92 that connects the vertical plate portion 90A and the horizontal plate portion 90B. According to such a configuration, the load transmission efficiency from the connecting portion 46 to the general portion 42 can be improved.

<Third Embodiment>
Hereinafter, the ceiling structure of the unit building according to the third embodiment of the present invention will be described with reference to FIG. The same components as those in the above-described first embodiment are designated by the same numbers, and the description thereof will be omitted.

In the present embodiment, instead of the ceiling girder 26, a "ceiling girder 100" as a constricted ceiling beam is provided. The ceiling girder 100 is made of channel steel made entirely of high-strength steel, both ends in the longitudinal direction are referred to as "general portions 100A", and the central portion in the longitudinal direction thereof is a "connecting portion". It is said to be "100B".

Specifically, the connecting portion 100B connects the general portions 100A to each other and is set to have a smaller beam length than the general portion 100A. Further, the bottom surface portion 100B1 of the connecting portion 100B is arranged above the bottom surface portion 100A1 of the general portion 100A in the height direction.

According to such a configuration, since the configuration is basically the same as that of the first embodiment described above, the same operation and effect as the ceiling structure of the unit building according to the first embodiment can be obtained.

Further, in the present embodiment, the general portion 100A and the connecting portion 100B are integrated, and the configurations of the frames 18, 52, and 56 can be simplified.

<Supplementary explanation of the above embodiment>
(1) In the above-described embodiment, the ceiling materials 64 and 66 are attached to the connecting portion via the base material 68, but the present invention is not limited to this. For example, a spacer may be provided between the base material 68 and the ceiling materials 64 and 66 to secure a space on the upper side of the ceiling material in the height direction.

(2) Further, in the above-described embodiment, the folded ceiling 80 is provided in the range extending over the three building units, but by adding the building unit 12, the range extending over the three or more building units can be increased. It is also possible to provide a folded ceiling 80.

(3) Further, in the above-described embodiment, the central side of the longer ceiling girder in the frame of the building unit in the longitudinal direction is constricted, but the present invention is not limited to this. That is, a plurality of building units in which the central side in the longitudinal direction of the shorter ceiling girder is constricted may be arranged along the longitudinal direction of the building unit to provide a folded ceiling.

10 buildings 12 building units 14 building units 16 building units 18 frames (framework)
26 Ceiling girder (constricted ceiling beam)
42 General part 42A Flange part 42F Bottom part 44 Mounting plate part 44A Flat part (mounting surface part)
46 Connecting part 50 Pipe material 50A End part 50C Bottom part 52 Frame (framework)
56 frames (framework)
60 Ceiling material (1st ceiling material)
62 Ceiling material (first ceiling material)
64 Ceiling material (second ceiling material)
66 Ceiling material (second ceiling material)
90 Load transmission part 100 Ceiling girder (constricted ceiling beam)
100A General part 100B Connection part

Claims (7)

It is provided for each of the building units on the boundary side between adjacent building units, constitutes a part of the outer peripheral portion of the upper part of the building in the frame of the building unit, and constitutes both ends in the longitudinal direction. The general part and the general part are arranged on the central side in the longitudinal direction to connect the general parts, the beam ceiling is set smaller than the general part, and the bottom part is arranged on the upper side in the building height direction than the bottom part of the general part. It has a constricted ceiling beam configured to include a joint.
Ceiling structure of the unit building. The general portion and the connecting portion are formed as separate bodies.
A mounting plate portion having a mounting surface portion facing the connecting portion side is provided at the end portion of the general portion on the connecting portion side.
The end of the connecting portion is joined to the mounting surface portion,
The ceiling structure of the unit building according to claim 1. The general part is made of channel steel having a flange part on the upper side of the building.
Further having a load transmitting portion capable of transmitting a load from the mounting plate portion to the flange portion.
The ceiling structure of the unit building according to claim 2. The connecting portion is composed of a plurality of pipe materials extending in the longitudinal direction of the constricted ceiling beam and adjacent to each other in a direction orthogonal to the longitudinal direction when viewed from the longitudinal direction.
The ceiling structure of the unit building according to claim 2 or 3. The plurality of pipe materials have a rectangular cross section when viewed from the longitudinal direction of the constricted ceiling beam, and are arranged adjacent to each other in a direction orthogonal to the building height direction when viewed from the longitudinal direction.
The ceiling structure of the unit building according to claim 4. The first ceiling material attached to the general part and
The second ceiling material attached to the joint and
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The ceiling structure of the unit building according to any one of claims 1 to 5. The constricted ceiling beams are arranged on the boundary side between the building units adjacent to the first direction in the building units arranged in a row in the first direction.
The ceiling structure of the unit building according to claim 6.

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