JP7310600B2 - support structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a support structure for supporting a plurality of ceiling foundations arranged around an atrium of a house.

2. Description of the Related Art Conventionally, there has been known a support structure that supports a plurality of ceiling foundations arranged around an atrium of a house. For example, the support structure of Patent Document 1 includes a plurality of joists extending horizontally in a region other than the opening region preset as the region for forming the opening, and the plurality of joists arranged to leave the opening region. A plurality of ceiling foundations fixed with screws over the ceiling joists, and a cloth stuck over the plurality of ceiling foundations are provided.

JP-A-09-78745

In the support structure described above, the cloth may break when the building vibrates due to an earthquake or the like. It is considered that this is because when the building vibrates, the plurality of ceiling linings are displaced relative to each other as the plurality of joists are displaced relative to each other, and the cloth cannot follow this displacement.

Therefore, the present invention has been made based on the above problems, and its object is to suppress the breakage of the cloth stuck over the plurality of ceiling foundations by suppressing the relative displacement of the plurality of ceiling foundations. It is to provide a support structure.

A support structure according to the present invention supports a plurality of ceiling foundations. The support structure includes a plurality of joists extending along the first direction in the horizontal direction in a region other than the opening region preset as the region for forming the opening, and the plurality of joists arranged to leave the opening region A plurality of ceiling bases fixed to the lower surface of the ceiling joist, a horizontal runner for forming a lateral edge extending in a second direction orthogonal to the first direction in the horizontal direction and extending in the second direction of the opening area; Prepare. The plurality of joists includes a plurality of first joist edges extending in a direction away from the opening region from the horizontal runner, a second joist edge adjacent to the longitudinal edge extending in the first direction of the opening region, and in the second direction a third joist edge adjacent to the second joist edge opposite the opening region; The support structure connects the first nearest joist edge and the second joist edge closest to the second joist edge of the plurality of first joist edges and the first nearest joist edge and the third joist edge It further comprises a connecting member having a main connecting portion fixed to the lower surface of the first closest joist edge, the second joist edge, and the third joist edge so as to connect with the edge.

According to the present invention, the first closest joist edge terminates at the lateral edge of the opening area, so the end is the second joist edge or third joist edge away from the opening area in the second direction during vibration of the building. It is likely to behave differently against Norim. For this reason, relative displacement is likely to occur between the ceiling base fixed to the first closest ceiling joist and the ceiling base fixed to the second or third ceiling joist. In the present invention, since the first nearest joist edge is connected to the second joist edge and the third joist edge by the main connection portion of the connecting member, it is difficult to relatively displace the second joist edge and the third joist edge Become. For this reason, since the relative displacement occurring between the ceiling base fixed to the first nearest joist and the ceiling base fixed to the second joist or third joist is suppressed, a plurality of ceiling bases It is possible to suppress breakage of the cloth stuck over the area.

The said structure WHEREIN: You may further provide the longitudinal runner for covering the side surface which faces the opening area side of said 2nd joist, and extending in said 1st direction, and forming the longitudinal edge of an opening area. The first closest lobe edge may extend from the end of the lateral runner in the second direction in a direction away from the opening region. The horizontal runner and the vertical runner may have a shape that opens a part of the lower surface of the first closest joist and the second joist for fixing the connecting member.

According to this configuration, the horizontal runner and the vertical runner have a shape that opens a part of the lower surface of the first nearest joist and the second joist to fix the connecting member, and the connecting member is the first It is fixed to the open portion of the lower surface of the nearest joist and the second joist. For this reason, the connecting member is suppressed from protruding below the ceiling joists with respect to the horizontal runners and the vertical runners, so that the unevenness of the ceiling base disposed at the position of the connecting member and the horizontal runners or vertical runners is suppressed. can do. For this reason, it is possible to achieve a beautiful finish in the state of attachment of the cloth that is attached over a plurality of ceiling substrates.

In the above configuration, the plurality of ceiling foundations have a joint appearing on an extension line of the arrangement position of the horizontal runner in the first direction, and the first nearest joint edge and the third joint edge in the second direction. It may be fixed to the lower surface of the plurality of ceiling joists in a state arranged so that a joint appears between.

According to this configuration, the possibility of relative displacement in the first direction increases between the ceiling bases arranged so that the joint appears on the extension line of the arrangement position of the horizontal runner in the first direction. In addition, the possibility of relative displacement in the second direction increases between the ceiling bases arranged so that the joint appears between the first closest joint edge and the third joint edge in the second direction. Therefore, the cloth is likely to break in the vicinity of the corners of the opening area. However, in this configuration, the first nearest joist edge is connected to the second joist edge and the third joist edge by the main connecting portion of the connecting member, so that the second joist edge and the third joist edge Since relative displacement in the first direction and the second direction is difficult, relative displacement in the first and second directions between the plurality of ceiling bases is suppressed. Therefore, breakage of the cloth near the corners of the opening region can be effectively suppressed.

In the above configuration, the connecting member connects the second adjacent joist edge and the first nearest joist edge arranged on the opposite side of the second joist edge of the first nearest joist edge in the second direction It may have a sub-connection portion fixed to the lower surface of the first nearest hem and the second adjacent hem so as to do.

According to this configuration, since the second adjacent joists are connected to the first nearest joists by the sub-connecting portion, relative displacement is less likely to occur with respect to the first nearest joists. For this reason, when multiple ceiling foundations are arranged so that joints appear between the first closest joist and the second adjacent joist, between the first closest joist and the second adjacent joist It is possible to effectively suppress the breakage of the cloth in. Also, when the joint is arranged so as to extend in the first direction at the position overlapping the second adjacent joist vertically, one of the ceiling foundations forming this joint is connected to each other by at least the sub-connecting part. Since it is fixed to the second adjacent joist and the first nearest joist, the force that causes the second adjacent joist and the first nearest joist to shift in the second direction is less likely to act on one of the ceiling foundations. . Therefore, it is possible to suppress breakage of one of the ceiling foundations. As a result, it is possible to effectively suppress the breakage of the cloth between the first closest hem and the second adjacent hem.

According to the present invention, by suppressing the relative displacement of the plurality of ceiling substrates, it is possible to suppress breakage of the cloth attached over the plurality of ceiling substrates.

FIG. 4 is a bottom view of a support structure according to an embodiment of the invention; It is the elements on larger scale which show the state by which the joist of the support structure which concerns on embodiment of this invention was supported by the joist receiver. It is another partial enlarged view which shows the state by which the ceiling joist of the support structure which concerns on embodiment of this invention was supported by the ceiling joist receiver. It is a figure which shows the fixing position to the joist of the connection member of the support structure which concerns on embodiment of this invention.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings. However, for convenience of explanation, each figure referred to below is a simplified representation of main components necessary for explaining the support structure according to the embodiment of the present invention. Accordingly, support structures according to embodiments of the present invention may include optional components not shown in the figures to which this specification refers.

The support structure 1 is a structure for supporting a plurality of ceiling bases 9 arranged around the atrium of a house. The support structure 1, as shown in FIGS. A vertical runner 6 and a horizontal runner 7 respectively forming the vertical edge and the horizontal edge of the opening area 5 preset as an area forming a connecting member 8 fixed over the lower surface of the plurality of joists 4, a plurality of A plurality of ceiling substrates 9 fixed over the lower surface of the ceiling joists 4 and a cloth 10 stuck over the lower surfaces of the plurality of ceiling substrates 9 are provided.

A plurality of joist receivers 3 are formed of channel steel elongated in one direction. The plurality of joist receivers 3 has a pair of upper and lower flanges 11 and 12 extending in one direction and a web 13 connecting end portions of the flanges 11 and 12 along one direction. The plurality of ceiling joist receivers 3 are arranged horizontally in a region other than the opening region 5 so as to extend in a second direction orthogonal to the first direction with the opening facing the first direction. The plurality of joist receivers 3 are arranged at predetermined intervals in the first direction. Each joist receiver 3 has a plurality of hanging tools 14 attached to the upper flange 11 at predetermined intervals in the second direction, and attached to the lower flange 12 at predetermined intervals in the second direction. A plurality of joist supports 15 are provided.

The plurality of hanging tools 14 are attached to the floor beam 2 positioned above each joist receiver 3 at predetermined intervals in the second direction. Thereby, each joist receiver 3 is suspended and supported by the floor beam 2. - 特許庁A plurality of joist supports 15 have engaging claws 16 that engage with the joist 4 .

The plurality of joists 4 are formed of a tubular steel material having a substantially rectangular cross section. A plurality of joists 4 are arranged in a region other than the opening region 5. - 特許庁The plurality of joists 4 extend along the first direction so as to be orthogonal to the joist receiver 3 on the lower side of the joist receiver 3, and are arranged at predetermined intervals in the second direction. Locking grooves 17 are formed on both side surfaces of each joist 4 along the first direction. The engaging claws 16 of the hoisting support 15 are engaged with the locking grooves 17 . Thereby, each joist 4 is supported by the joist support 15 . In addition, the support by the ceiling joist support 15 is made at each intersection of each ceiling joist 4 and the ceiling joist receiver 3 . A heat insulating material 21 made of glass wool, rock wool, or the like is installed on the upper surfaces of the plurality of joists 4 .

As shown in FIG. 1, the plurality of joists 4 includes a plurality of first joists 18 extending in a direction away from the opening region 5 from the two lateral runners 7 extending in the second direction, and a first direction of the opening region 5 Two second joist edges 19 respectively adjacent to the two longitudinal edges extending to and two third joist edges respectively adjacent to the two second joist edges 19 on the side opposite to the opening region 5 in the second direction 20 and

Here, the plurality of first joists 18, two second joists 19, two vertical runners 6, two horizontal runners 7, and connecting members 8 have a left-right asymmetrical structure in the plane of FIG. 1, the support structure 1 is divided into a left side portion and a right side portion and explained in order. In addition, the plurality of first joists 18, two second joists 19, two vertical runners 6, two horizontal runners 7, and the connecting member 8 have a vertically symmetrical structure on the paper surface of FIG. . For this reason, only the lower part of the support structure 1 will be described in the space of FIG. 1, and the description of the upper part will be omitted. First, the left side of the paper surface of FIG. 1 will be described.

The plurality of first joists 18 are arranged such that one end in the first direction is connected to the horizontal runner 7 . The first joist edge 18 closest to the second joist edge 19 on the left side among the plurality of first joist edges 18 constitutes the first closest joist edge 18a. One end of the first closest joint edge 18a in the first direction is located at the left end of the lateral runner 7 in the second direction. The first closest joist edge 18a and the second joist edge 19 on the left side are arranged so as to have portions arranged on the same imaginary straight line extending in the first direction (see FIG. 4). The first joist edge 18 arranged on the side opposite to the second joist edge 19 of the first closest joist edge 18a in the second direction constitutes the second adjacent joist edge 18b.

A vertical runner 6 is fixed to the second joist edge 19 on the left side. The second joist edge 19 on the left side is formed to have a length substantially equal to the length of the longitudinal edge of the opening region 5 in the first direction.

The third joist edge 20 on the left side is arranged so as to be adjacent to the second joist edge 19 on the opposite side (left side) of the opening region 5 in the second direction.

As shown in FIGS. 1 and 3, the left vertical runner 6 has a substantially U-shaped cross section taken along a plane orthogonal to the first direction. Each vertical runner 6 has a side surface portion 6a facing the opening region 5 in the second direction, and an upper surface portion 6b and a lower surface portion 6c extending from both ends of the side surface portion 6a in the vertical direction in the direction opposite to the opening region 5. have.

As shown in FIGS. 3 and 4, the left vertical runner 6 is fixed to the left second joist 19 while covering the left second joist 19 with the side surface 6a, the upper surface 6b and the lower surface 6c. It is As shown in FIG. 4, the lower surface portions 6c at both ends of the left vertical runner 6 in the first direction are notched so as to open the lower surfaces at both ends of the left second joist 19 in the first direction. there is In addition, the side surface portion 6a, the upper surface portion 6b, and the lower surface portion 6c at both ends of the left vertical runner 6 in the first direction are notched so as to open both ends of the second joist rim 19 on the left side in the first direction. may Also, the left vertical runner 6 may be omitted.

As shown in FIGS. 2 and 4, the two horizontal runners 7 are substantially U-shaped in cross section taken along a plane orthogonal to the second direction. Each horizontal runner 7 has a side surface portion 7a facing the opening region 5 side in the first direction, and an upper surface portion 7b and a lower surface portion 7c extending from both ends of the side surface portion 7a in the vertical direction in the direction opposite to the opening region 5. have. The left end of each lateral runner 7 in the second direction is notched so as to open one end in the first direction of the first nearest contact edge 18a (see FIG. 4). Each horizontal runner 7 covers one end of the plurality of first joists 18 in the first direction with the side surface portion 7a, the upper surface portion 7b, and the side surface portion 7c. (see Figures 1, 2, 4). The left end of each horizontal runner 7 in the second direction is separated from one end of the left vertical runner 6 in the first direction. The left end of each horizontal runner 7 in the second direction may be connected to one end of the left vertical runner 6 in the first direction.

The connecting members 8 are formed of iron plates, and four in total are provided near the four corners of the opening region 5 (see FIG. 1). As shown in FIGS. 1 and 4, the two connecting members 8 on the left are fixed over the lower surfaces of the first closest joist edge 18a, the second joist edge 19 on the left side, and the third joist edge 20 on the left side. and a sub-connecting portion 8b integrally formed with the main connecting portion 18a.

The main connecting portion 8a has a portion that is open from the lower surface of the vertical runner 6 on the lower surface of the second joist edge 19 on the left side, and a portion that is open from the horizontal runner 7 on the lower surface of the first closest joist edge 18a. and the lower surface of the third joist edge 20 (see FIG. 4). As a result, the main connecting portion 8a is arranged so as not to overlap the vertical runners 6 and the horizontal runners 7 vertically. As a result, the main connecting portion 8a is prevented from protruding below the joist 4 with respect to the vertical runners 6 and the horizontal runners 7 . The shape and size of the main connecting portion 8a are such that the first nearest joist edge 18a, the second joist edge 19, and the third joist edge 20 can be connected to each other, and the vertical runner 6 and the horizontal runner 7 overlap vertically. It is not particularly limited as long as it can be arranged so that it does not occur. In this embodiment, the main connecting portion 8a is formed in a rectangular shape.

The sub-connecting portion 8b is formed so as to extend in the second direction at a position adjacent to the horizontal runner 7 in the first direction so as not to overlap the horizontal runner 7 vertically. The sub-connecting portion 8b is fixed over the lower surfaces of the first closest joist edge 18a and the second adjacent joist edge 18b. In addition, the shape and size of the sub-connecting portion 8b is particularly limited as long as it can connect the first closest joist edge 18a and the second adjacent joist edge 18b and can be arranged so as not to overlap the horizontal runner 7 vertically. never. In this embodiment, the secondary connecting portion 8b is formed in a rectangular shape whose length in the first direction is shorter than that of the main connecting portion 8a (see FIG. 4).

The right side portion of the support structure 1 will be described below with respect to the plurality of joists 4, vertical runners 6, horizontal runners 7 and connecting members 8. FIG. Elements corresponding to the left portion of the support structure 1 are assigned the same reference numerals as those of the left portion of the support structure 1. FIG. In the following, the right side portion of the support structure 1 will be described with respect to the portions that are different from the left side portion of the support structure 1 .

The first joist edge 18 closest to the second joist edge 19 on the right side constitutes the first closest joist edge 18a (see FIG. 1). The first closest joint edge 18a is arranged at a position away from the right end of the lateral runner 7 in the second direction to the left in the second direction.

The third joist edge 20 on the right side has a second direction spacing between the second joist edge 19 on the right side and the second joist edge 20 on the left side and the second joist edge 19 on the left side in the second direction. It is arranged close to the right second joist 19 so as to be smaller than the spacing (see FIG. 1).

The vertical runner 6 on the right side may be omitted as well as the vertical runner 6 on the left side.

The connecting member 8 on the right side has only the main connecting portion 8a, and the sub-connecting portion 8b is omitted. The main connecting portion 8a of the right connecting member 8 is opened from the lower surface portion 6c of the right vertical runner 6 on the lower surface of the right second joist edge 19 so as not to vertically overlap the right vertical runner 6 and the horizontal runner 7. The part, the lower surface of the first closest joist edge 18a on the right side, the lower surface of the third joist edge 20 on the right side, and the joist edge 4 adjacent to the right side of the third joist edge 20 on the right side in the second direction It is fixed across the bottom surface (see FIG. 1).

In addition, the shape and size of the main connecting portion 8a of the right connecting member 8 is such that if the right first closest joist edge 18a, the right second joist edge 19, and the right third joist edge 20 can be connected to each other, It is not particularly limited. For example, the shape and size of the main connecting portion 8a on the right side may be a shape and size that do not vertically overlap the lower surface of the joist 4 adjacent to the third joist edge 20 on the right side in the second direction.

A plurality of ceiling substrates 9 are made of gypsum board. A plurality of ceiling bases 9 are installed in areas other than the opening area 5 . Specifically, the plurality of ceiling bases 9 are arranged such that the edges of the ceiling substrate 9 are aligned with the vertical edges of the opening region 5 , the lower surfaces 6 c of the vertical runners 6 , the lower surfaces of the connecting members 8 , the second joists 19 , and the third joists . It is fixed to the lower surface portion 6c of the vertical runner 6 and the lower surfaces of the second joist 19 and the third joist 20 in a state of being superimposed on each lower surface of the runner 20 (see FIG. 3). Furthermore, the plurality of ceiling substrates 9 includes a plurality of first lower surface portions 7c of the lateral runners 7, the lower surface of the connecting member 8, and the first closest joint edge 18a such that the edges match the lateral edges of the opening region 5. It is fixed to each lower surface of a plurality of first joists 18 including the lower surface portion 7c of the horizontal runner 7 and the first nearest joist edge 18a in a state of being superimposed on each lower surface of the joist 18 (see FIG. 2) .

A plurality of ceiling foundations 9 are installed so that joints appear near the corners of the opening region 5 . In the example of FIG. 1, the plurality of ceiling foundations 9 have joints 23 appearing on the extension line of the arrangement position of the horizontal runner 7 in the first direction, and the first nearest joint edge 18a and the third joint edge in the second direction. It is arranged over each lower surface of the plurality of ceiling joists 4 so that a joint 24 appears between them. In the example of FIG. 1, the joint 24 is located on the extension line of the arrangement position of the vertical runner 6 in the second direction. The positions of the joints formed by the adjacent ceiling foundations 9 are not limited to the above. For example, the joint 23 may appear at a position away in the first direction from a position on the extension line of the arrangement position of the vertical runner 6 in the second direction. The joint 24 may also appear between the first closest joint edge 18a and the second closest joint edge 18b.

Moreover, the position of the joint which the adjacent ceiling foundation 9 forms may appear so that the joint 25 may extend in a 1st direction in the position which overlaps the 2nd adjacent joist 18b up and down (refer FIG. 1). In this case, the left ceiling substrate 9 forming the joint 25 is fixed to the second adjacent joist edge 18b and the first closest joist edge 18a which are connected to each other by at least the sub-connecting portion 8b. The right ceiling base 9 forming the joint 25 is at least the second adjacent joist edge 18b and the first joist edge 18 adjacent in the second direction opposite to the first nearest joist edge 18a from the second adjacent joist edge 18b. fixed to

The cloth 10 is affixed over the lower surfaces of the plurality of ceiling foundations 9 (see FIGS. 2 and 3).

In the support structure 1, since the first nearest joist edge 18a is connected to the second joist edge 19 and the third joist edge 20 by the main connecting portion 8a of the connecting member 8 (see FIG. 1), the second joist Relative displacement with respect to the edge 19 and the third joist edge 20 is difficult. For this reason, the ceiling base 9 fixed over each lower surface of the plurality of first joist edges 18 including the first closest joist edge 18a, and the second joist edge 19 and each lower surface of the plurality of third joist edges 20 Since the relative displacement between the ceiling base 9 fixed over the ceiling base 9 is suppressed, breakage of the cloth 10 affixed over the plurality of ceiling bases 9 can be suppressed.

In the support structure 1 described above, the horizontal runners 7 and the vertical runners 6 have a shape in which the lower surfaces of the first nearest joist edge 18a and the left and right second joist edges 19 are partly opened in order to fix the connecting member 8 . , the main connecting portion 8a of the connecting member 8 is fixed to the open portions of the lower surfaces of the first closest joist edge 18a and the left and right second joist edges 19 (see FIG. 4). For this reason, the connecting member 8 is restrained from protruding below the joist 4 with respect to the horizontal runners 7 and the vertical runners 6 , so that the connecting member 8 is arranged across the lower surface of the connecting member 8 and the lower surface portion 6 c of the vertical runner 6 . Unevenness of the ceiling base 9 placed over the lower surface of the connecting member 8 and the lower surface portion 7c of the horizontal runner 7 can be suppressed. Therefore, the cloth 10 stuck over the plurality of ceiling bases 9 can be neatly stuck.

In the above-described support structure 1, the plurality of ceiling foundations 9 are installed so that the joints 23 appear on the extension lines of the arrangement positions of the horizontal runners 7 in the first direction. 9 may be relatively displaced in the first direction. In addition, in the support structure 1, the plurality of ceiling foundations 9 are installed so that the joint 24 appears between the first nearest joist edge 18a and the third joist edge 20 in the second direction. There is a possibility that the ceiling bases 9, 9 forming 24 are relatively displaced in the second direction (see FIG. 1). However, in the support structure 1, the first nearest joist edge 18a, the second joist edge 19 and the third joist edge 20 are connected to each other by the main connection portion 8a, so that the first nearest joist edge 18a and the third Since the relative displacement of the second joist edge 19 and the third joist edge 20 in the first direction and the second direction is suppressed, the relative displacement of the plurality of ceiling bases 9 in the first and second directions is suppressed. Therefore, breakage of the cloth 10 near the corners of the opening region 5 can be effectively suppressed.

In the support structure 1, the second adjacent joist edge 18b is connected to the first nearest joist edge 18a by the sub-connecting portion 8b, so relative displacement is less likely to occur with respect to the first nearest joist edge 18a. For this reason, when a plurality of ceiling bases 9 are arranged so that a joint appears between the first nearest joist edge 18a and the second adjacent joist edge 18b, the ceiling bases 9, 9 that form this joint Since the relative displacement in two directions is suppressed, it is possible to effectively suppress breakage of the cloth 10 between the first closest joist edge 18a and the second adjacent joist edge 18b.

Furthermore, in the support structure 1, since the joint 25 is arranged so as to extend in the first direction at a position overlapping the second adjacent joist 18b (see FIG. 1), the left ceiling forming this joint 25 The substrate 9 is fixed to the second adjacent joist edge 18b and the first nearest joist edge 18a which are connected to each other by at least the sub-connecting portion 8b. For this reason, the left ceiling foundation 9 forming the joint 25 is less likely to be subjected to a force that causes the second adjacent joist edge 18b and the first nearest joist edge 18a to shift in the second direction, so the joint 25 is formed. It is possible to suppress the breakage of the ceiling base 9 on the left side. As a result, breakage of the cloth 10 between the first closest joist edge 18a and the second adjacent joist edge 18b can be effectively suppressed.

In the above support structure 1 , both the left and right vertical runners 6 are fixed to the second joist 19 , but at least one of the left and right vertical runners 6 may not be fixed to the second joist 19 . In this case, for example, the right second joist 19 is spaced from the longitudinal runner 6 in the second direction opposite the opening area 5 . Furthermore, in this case, the third joist edge 20 on the right side corresponds to the second joist edge, and the joist edge 4 adjacent to the third joist edge 20 on the right side in the second direction opposite to the opening region 5 is the third Corresponds to Norim.

1 support structure 4 joist 5 opening area 6 vertical runner 7 horizontal runner 8 connecting member 8a main connecting portion 8b sub-connecting portion 9 ceiling base 18 first joist 18a first closest joist 18b second adjacent joist 19 second Joint 20 Third joint 23 joint 24 joint 25 joint

Claims (4)

A support structure for supporting a plurality of ceiling foundations,
A plurality of joists extending along the first direction in the horizontal direction in a region other than the opening region preset as the region forming the opening;
a plurality of ceiling foundations fixed to the lower surfaces of the plurality of ceiling joists while being arranged so as to leave an opening area;
a lateral runner extending in a horizontal direction in a second direction orthogonal to the first direction and for forming a lateral edge extending in the second direction of the opening region;
The plurality of joists includes a plurality of first joist edges extending in a direction away from the opening region from the horizontal runner, a second joist edge adjacent to the longitudinal edge extending in the first direction of the opening region, and in the second direction and a third joist edge adjacent to the second joist edge on the opposite side of the opening region,
The support structure connects the first nearest joist edge and the second joist edge closest to the second joist edge of the plurality of first joist edges and the first nearest joist edge and the third joist edge A connection member having a main connection portion fixed to the lower surface of the first nearest joist edge, the second joist edge, and the third joist edge so as to connect with the edge,
support structure. Further comprising a vertical runner for covering the side surface of the second joist facing the opening area side and extending in the first direction to form a vertical edge of the opening area,
The first closest lobe edge extends from the end of the lateral runner in the second direction in a direction away from the opening region,
The support structure according to claim 1, wherein the horizontal runners and the vertical runners have a shape that opens a part of the lower surface of the first closest joist and the second joist to fix the connecting member. In the plurality of ceiling foundations, a joint appears on an extension line of the arrangement position of the horizontal runner in the first direction, and between the first nearest joint edge and the third joint edge in the second direction. The support structure according to claim 1 or 2, wherein the support structure is fixed to the lower surfaces of the plurality of joists in a state where joints are exposed. Said connecting member, said so as to connect the second adjacent joists and said first nearest joists arranged on the side opposite to said second joists of said first nearest joists in said second direction The support structure according to any one of claims 1 to 3, having a sub-connecting part fixed to the lower surface of the first nearest joist and the second adjacent joist.

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