JP7164393B2 - Building reinforcement structure - Google Patents

Description

The present invention relates to reinforcement structures for buildings.

BACKGROUND ART Conventionally, there is known a reinforcing structure in which reinforcing beams are provided in a framework structure using beams and pillars used in building units and the like (see, for example, Patent Literature 1).
In the conventional building reinforcement structure described in Patent Document 1, the reinforcing beam is divided into an upper joist member and a lower joist member. A connection fitting that joins the upper joist material and the lower joist material, and an end joining fitting that connects an end portion of the upper joist material and the first ceiling beam are provided, and the lower joist material is paired with the first ceiling beam. It has a structure that is engaged with the ceiling beam.

JP 2012-62699 A

By the way, in a frame structure, when a door or the like is provided inside the outer periphery of the frame structure, such as a lead-in entrance, it is necessary to provide a reinforcing beam that supports the door or the outer wall at a position inside the outer periphery of the frame structure. There is

However, although the above-mentioned conventional building reinforcement structure can support the ceiling, the reinforcing beams are divided, and it is not suitable for high-strength support such as the support of the pull-in wall. Moreover, in the above-described conventional technology, it is difficult to bridge between a pair of ceiling beams and to provide a part of the frame structure between the pair of ceiling beams, and the degree of freedom in designing height and length is low.

The present disclosure focuses on the above problem, and aims to provide a building reinforcement structure and a building that can obtain high support strength and have excellent design flexibility.

The reinforcing structure of the building of the present disclosure includes:
A reinforcing structure for a building in which a frame structure is formed by beams and pillars,
The upper edge of the framework structure includes a pair of first ceiling beams arranged substantially parallel in a first direction and a pair of ceiling beams arranged substantially parallel in a second direction substantially orthogonal to the first direction. is formed by the second ceiling beam of
Between the first ceiling beams, a plurality of ceiling joist members arranged along the second direction are spanned at intervals in the first direction,
A third beam member is provided in parallel with the ceiling joist member,
A reinforcing beam joined to the second ceiling beam by a connecting fitting and joined to the third beam member by an end joint fitting ,
The reinforcing beam is a reinforcing structure of a building provided at a lower position than a member to be joined by the end joint fitting .

In addition, the reinforcing structure of the building of the present disclosure is
A reinforcing structure for a building in which a frame structure is formed by beams and pillars,
The upper edge of the framework structure includes a pair of first ceiling beams arranged substantially parallel in a first direction and a pair of ceiling beams arranged substantially parallel in a second direction substantially orthogonal to the first direction. is formed by the second ceiling beam of
Between the first ceiling beams, a plurality of ceiling joist members arranged along the second direction are spanned at intervals in the first direction,
A reinforcing beam joined to the second ceiling joist by a connecting fitting and joined to the ceiling joist member by an end joining fitting,
The reinforcing beam is a reinforcing structure of a building provided at a lower position than a member to be joined by the end joint fitting .

The reinforcing structure of the building and the building of the present disclosure can obtain high support strength and have excellent design flexibility due to the above configuration . In addition, since the reinforcing beam is provided at a position lower than the member to be joined by the end joint fitting, the reinforcing beam can be provided below the member to be joined without dividing, and the member to be supported can be can be supported more strongly.

2 is a schematic plan view showing a schematic structure of a building unit U of a building H to which the building reinforcement structure of Embodiment 1 is applied; FIG. 4 is a plan view showing the essential parts of the building unit U; FIG. 1 is an exploded perspective view showing a reinforcing structure for a building according to Embodiment 1; FIG. FIG. 3 is a cross-sectional view showing the reinforcing structure of the building of Embodiment 1, showing the cross section at the position of line S4-S4 in FIG. 2; FIG. 5 is a cross-sectional view showing the main part of the reinforcing structure for the building of Embodiment 1, showing the cross section at the position of line S5-S5 in FIG. 4; 3 is a perspective view showing a main part of the building unit U; FIG. FIG. 4 is a cross-sectional view showing a reinforcing structure of a building according to Embodiment 2;

Hereinafter, embodiments of the reinforcing structure of the building and the building of the present disclosure will be described.
(Embodiment 1)
FIG. 1 is a schematic plan view showing a building unit U that constitutes a building H to which the building reinforcement structure of Embodiment 1 is applied. The building H is constructed by installing a plurality of building units U adjacent to each other in the horizontal direction and the vertical direction at the construction site.

This building unit U, as shown in FIG. It is considered to be a box-shaped Rahmen structure (framework structure).

A pair of first ceiling beams 21, 21 and a pair of second ceiling beams 22, 22 are provided as beam members at the upper edge of the building unit U. The first ceiling beams 21 , 21 are arranged substantially parallel along the first direction indicated by the arrow D<b>1 and bridge between the upper ends of the pillars 10 . The second ceiling beams 22 , 22 are arranged substantially parallel along a second direction indicated by an arrow D<b>2 substantially orthogonal to the first direction, and span between the upper ends of the pillars 10 , 10 .

Both ceiling beams 21 and 22 are formed of a channel material having a similar U-shaped cross section, and as shown in FIG. A pair of beam flange portions 20b, 20b is provided. In the beam flange portion 20b on the lower side of the second ceiling beam 22, bolt insertion holes 20c, 20c are opened at the same positions as the reinforcing beams 30 in the second direction.

2 and 3, a plurality of ceiling joists (ceiling joist members) 23 (ceiling joist members) arranged along the second direction (D2) are provided between the pair of first ceiling beams 21, 2 and 3) are spaced apart in a first direction (D1). The ceiling joists 23 are made of long wooden square timbers, and their bottom ends are positioned slightly lower than the second ceiling beams 22, as shown in FIG. Although detailed illustration is omitted, the first ceiling beam 21 is also arranged at the same height as the second ceiling beam 22, and the lower end of the ceiling joist 23 is slightly higher than the lower end position of the first ceiling beam 21. placed in a low position.

The building reinforcement structure of Embodiment 1 is applied to a building unit U having an entrance Et of a building H shown in FIG. This entrance Et is in the form of a so-called lead-in entrance provided in the building unit U in a concave shape. That is, as shown in FIG. 6, the outer wall OW is formed in a concave shape, and the lead-in wall IW and the door Dr are provided on the position side of the outer periphery of the building unit U. As shown in FIG. As shown in FIG. 1, this lead-in wall IW is installed in the middle position in the second direction in the building unit U, and its length in the first direction is the dimension between the second ceiling beams 22, 22. It is formed to have a dimension of about 1/3 (total length).

The reinforcing structure of the building according to Embodiment 1 is a structure including a reinforcing beam 30 (see FIGS. 3 and 4) that supports the lead-in wall IW and the upper part of the door Dr. As shown in FIGS. 1 and 2, this reinforcing beam 30 extends in the first direction along the arrow D1, and its total length is the same as the dimension of the lead-in wall IW in the first direction. The dimension is about 1.3 of the total length in the first direction. The reinforcing beam 30 is joined to the second ceiling beam 22 and the third beam (third beam member) 24 at both ends in the longitudinal direction.

Here, the third beam 24 will be described. The third beam 24 is provided along the second direction (the direction along the arrow D2) in parallel with the ceiling joist 23, and both ends in the longitudinal direction are the first ceiling beam 21, 21. As shown in FIGS. 3 and 4, the third beam 24 is formed of a channel material having a U-shaped cross section, and includes a vertical sidewall portion 24a and a pair of horizontal beams extending horizontally from the upper and lower sides of the sidewall portion 24a. and flanges 24b, 24b. In the side wall portion 24a, bolt insertion holes 24c, 24c are opened at the same positions as the reinforcing beams 30 in the second direction.

As shown in FIG. 3, the third beam 24 is fixed to the first ceiling beams 21, 21 by connecting end plates 24d to both longitudinal ends of the third beam 24, The flange 24f of the first ceiling beam 21 is in contact with the side wall portion 20a of the first ceiling joist 21, and is fastened and connected by fasteners 42 having bolts and nuts. In addition, as shown in FIG. 4, the third beam 24 is smaller in vertical dimension than the second ceiling beam 22 and the first ceiling beam 21 (not shown in FIG. 4), and the height of the lower end is , the second ceiling beam 22 and the first ceiling beam 21 are arranged at substantially the same height.

Next, the details of the structure of the reinforcing beam 30 and the joining structure between the reinforcing beam 30 and the second ceiling beam 22 and the third beam 24 will be described.

First, the structure of the reinforcing beams 30 will be described. As shown in FIG. and a pair of flange portions 30b, 30b extending horizontally from the top and bottom of the housing. A connection metal fitting 31 and an end joint metal fitting 32 are integrally joined to the ends of the reinforcing beams 30 in the longitudinal direction by welding or the like.

As shown in FIGS. 3 and 4, the connecting fitting 31 is formed to have an inverted L-shaped cross section, and includes a substantially rectangular plate-like base plate 31a joined to the end face of the reinforcing beam 30 by welding or the like, and the base plate 31a. and a horizontal flange 31b integrally formed with the upper end of the and extending in the horizontal direction.

The base plate 31a extends to a position higher than the upper flange portion 30b of the reinforcing beam 30, so that the horizontal flange 31b is positioned higher than the upper flange portion 30b of the reinforcing beam 30. ing. Further, the horizontal flange 31b is formed longer than the base plate 31a in the second direction (the direction along the arrow D2), and has bolt insertion holes 31c, 31c.

The end joint metal fitting 32 is also formed to have an inverted L-shaped cross section like the connecting metal fitting 31, and is connected to a substantially rectangular base plate 32a joined to the end surface of the reinforcing beam 30 by welding or the like, and the upper end of the base plate 32a. Integrally formed and horizontally extending horizontal flange 32b.

The base plate 32a is longer than the base plate 31a of the connecting fitting 31 in the vertical direction. That is, as shown in FIG. 4, the base plate 32a is formed to be longer than the sum of the vertical dimensions of the reinforcing beam 30 and the third beam 24. As shown in FIG. Furthermore, bolt insertion holes 32c, 32c are opened in the upper and lower sides of the base plate 32a.

Next, a joint structure between the reinforcing beam 30 and the second ceiling beam 22 and the third beam 24 will be described.
First, the joint structure between the connecting fitting 31 of the reinforcing beam 30 and the second ceiling beam 22 will be described. In this joint structure, the horizontal flange 31b of the connecting fitting 31 is superimposed on the beam flange portion 20b on the lower side of the second ceiling beam 22 and engaged in the vertical direction, and the bolt insertion hole 31c and the bolt insertion hole 20c on top of each other. The horizontal flange 31b and the beam flange portion 20b are fastened with a fastener 41 that fastens a bolt and a nut penetrating through the bolt insertion holes 31c and 20c. As a result, one longitudinal end of the reinforcing beam 30 is joined to the second ceiling beam 22 .

Next, the joint structure between the end joint fitting 32 of the reinforcing beam 30 and the third beam 24 will be described. This joining is performed by placing the horizontal flange 32b of the end joint fitting 32 on top of the upper horizontal flange 24b of the third beam 24 and engaging it in the vertical direction, and the base plate 32a is placed on the third beam 24. While making it contact|abut on the side wall part 24a, the bolt insertion hole 32c and the bolt insertion hole 24c overlap horizontally. A fastener 42 is used to fasten the bolt and nut inserted through the bolt insertion holes 32c and 24c.

(Effect of Embodiment)
The effects of the reinforcing structure of the building and the building H of Embodiment 1 are listed below.
(1) The building reinforcement structure of Embodiment 1 is a building reinforcement structure in which a building unit U as a frame structure is formed by beam members and column members 10,
The upper edge of the building unit U consists of a pair of first ceiling beams (beams) 21 arranged substantially parallel in a first direction (direction along arrow D1) and a second direction substantially orthogonal to the first direction. formed by a pair of second ceiling beams (beam members) 22 arranged substantially parallel in the direction (direction along arrow D2),
Between the first ceiling beams 21, a plurality of ceiling joists 23 arranged along the second direction are spanned at intervals in the first direction,
A third beam 24 is provided in parallel with the ceiling joist 23,
A reinforcing beam 30 is joined to the second ceiling beam 22 by a connecting metal fitting 31 and to the third beam 24 by an end joint metal fitting 32 .

Therefore, a high-strength reinforcing beam 30 capable of supporting the lead-in wall IW, the door Dr, etc. is placed between the pair of second ceiling beams 22, 22 of the building unit U, unlike the conventional divided structure. It is possible to provide high support strength without having to do it. In particular, in the first embodiment, the lead-in wall IW and the reinforcing beam 30 are provided in the building unit U so as to have a length of about 1/3 in the direction along the relatively long first ceiling beam 21. In the prior art, a reinforcing beam having the same dimensions as the first ceiling beam 21 is provided and divided, so it is difficult to obtain high support strength. Furthermore, in Embodiment 1, the length and installation height of the reinforcing beams 30 can be arbitrarily set based on the length of the reinforcing beams 30 and the dimensions of the connecting fittings 31 and the end joint fittings 32. and excellent design freedom.

(2) In the reinforcing structure of the building of Embodiment 1, the reinforcing beams 30 are provided below the ceiling joist 23 which is the member to be joined with the end joint metal fittings 32 .
Therefore, the reinforcing beams 30 are provided below the ceiling joist 23 without being divided, and it becomes possible to more firmly support members to be supported such as the lead-in wall IW and the door Dr.

(3) In the building reinforcement structure of Embodiment 1, the metal fitting heights of the connecting metal fittings 31 and the end joint metal fittings 32 are different.
Therefore, even if the second ceiling beam 22 and the ceiling joist 23 are different in height, the reinforcing beam 30 can be provided substantially horizontally.

(4) In the reinforcing structure of the building according to Embodiment 1, the connecting fitting 31 is joined to the beam flange portion 20b of the second ceiling beam 22 .
Therefore, compared with the case where it joins to the side wall part 20a of the 2nd ceiling beam 22, etc., it can join firmly. Moreover, it is possible to temporarily fix the reinforcing beams 30 at the time of assembly work, and the assembly workability is excellent.

(5) In the building reinforcing structure of Embodiment 1, the end joint fitting 32 is joined to the horizontal flange 24b which is the upper surface of the third beam 24, which is the member to be joined.
Therefore, as compared with the case where only the side wall portion 24a of the third beam 24 is joined, the joint can be made stronger. In addition, temporary fixing or the like can be performed during assembly work, so assembly workability is excellent.

(6) In the building H of Embodiment 1, the connecting metal fittings 31 and the end joint metal fittings 32 are arranged at different heights in the vertical direction with respect to the second ceiling beam 22 and the third beam 24 as a mating member. can be temporarily installed by engaging with the
Therefore, workability when installing the reinforcing beams 30 after assembling the building units U is excellent, and the building units U can be shared even if there are differences in specifications such as the presence or absence of the retractable entrance Et. It is economical and has excellent workability.

(6) The building H of Embodiment 1 is provided with the reinforcing structure of the building described in (1) to (5) above.
Therefore, it is possible to provide a building H that exhibits any or all of the effects described in (1) to (5) above.

(Embodiment 2)
Next, the reinforcement structure of the building of Embodiment 2 is demonstrated.
As shown in FIG. 7, the second embodiment is an example in which the joint target of the end joint fitting 232 is the ceiling joist 23 .

Therefore, the shape of the end joint fitting 232 is different from the end joint fitting 32 shown in the first embodiment. That is, the vertical dimension of the base plate 232a of the end fitting 232 is shorter than the base plate 32a of the first embodiment, and the horizontal flange 232b is arranged at a lower position than the horizontal flange 32b of the first embodiment. The end joint fitting 232 is joined to the ceiling joist 23 by the fastener 242 while the horizontal flange 232 b is engaged with the upper side surface 23 a of the ceiling joist 23 .
(2-1) The building reinforcement structure of Embodiment 3 is a building reinforcement structure in which a building unit U as a frame structure is formed by beam members and column members 10,
The upper edge of the building unit U consists of a pair of first ceiling beams (beams) 21 arranged substantially parallel in a first direction (direction along arrow D1) and a second direction substantially orthogonal to the first direction. formed by a pair of second ceiling beams (beam members) 22 arranged substantially parallel in the direction (direction along arrow D2),
Between the first ceiling beams 21, a plurality of ceiling joists 23 arranged along the second direction are spanned at intervals in the first direction,
A reinforcing beam 30 is joined to the second ceiling beam 22 by a connecting fitting 31 and to the ceiling joist 23 by an end joining fitting 232 .

Therefore, a high-strength reinforcing beam 30 capable of supporting the lead-in wall IW, the door Dr, etc. is placed between the pair of second ceiling beams 22, 22 of the building unit U, unlike the conventional divided structure. It is possible to provide high support strength without having to do it. In particular, in the first embodiment, the lead-in wall IW and the reinforcing beam 30 are provided in the building unit U so as to have a length of about 1/3 in the direction along the relatively long first ceiling beam 21. In the prior art, a reinforcing beam having the same dimensions as the first ceiling beam 21 is provided and divided, so it is difficult to obtain high support strength. Furthermore, in Embodiment 1, the length and installation height of the reinforcing beam 30 can be arbitrarily set based on the length of the reinforcing beam 30 and the dimensions of the connecting fittings 31 and the end joint fittings 232. and excellent design freedom.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the present invention is not limited to the embodiments, and the present invention may be modified without departing from the gist of the present invention. include.
For example, in the embodiment, the first ceiling beam 21 and the second ceiling beam 22 of the building unit U are relatively long. may be the relatively longer dimension.

Further, the shapes and dimensions of the reinforcing beams 30, the connecting fittings 31, and the end joining fittings 32 are not limited to those shown in the embodiment. Furthermore, the joining structure of the connecting metal fittings 31 and the end joining metal fittings 32 to the second ceiling beam 22 and the joining structure to the third beam 24 or the ceiling joists 23 are not limited to the structures shown in the embodiments. . For example, although the connecting fitting 31 is joined to the lower beam flange portion 20b of the second ceiling beam 22, it may be joined to the side wall portion 20a or the upper beam flange portion 20b. And in the case of the structure which joins the connection metal fitting 31 to the side wall part 20a, the horizontal flange 31b is unnecessary. Also, the shape of the connecting metal fitting 31 can be appropriately changed in design according to the shape of the second ceiling beam 22 . Furthermore, when joining the connecting metal fittings 31 and the second ceiling beams 22, other fixing structures such as rivets and welding may be used in addition to using the fasteners 41 having bolts and nuts.

Also, the shape of the end joint metal fittings 32 and joints with respect to the third beam 24 and the ceiling joists 23 are not limited to those of the embodiment. For example, when the third beam 24 and the ceiling joist 23 have a horizontal flange 24b like the third beam 24 of the embodiment, they can be joined to the lower horizontal flange 24b. Also, the shape of the end joint metal fitting 32 can be appropriately changed in design according to the shapes of the third beam 24 and the ceiling joists 23 . Furthermore, when joining the end joint fitting 32 to the third beam 24 or the ceiling joist 23, in addition to using fasteners 42 and 242 having bolts and nuts, other fixing structures such as rivets and welding may be used. good.

10 Column material 20b Beam flange portion 21 First ceiling beam 22 Second ceiling beam 23 Ceiling joist (Ceiling joist member)
23a Upper surface 24 Third beam (third beam member)
30 Reinforcement beam 31 Connecting metal fitting 31a Base plate 31b Horizontal flange 31c Bolt insertion hole 32 End joint metal fitting 32a Base plate 32b Horizontal flange 32c Bolt insertion hole 232 End joint metal fitting 232a Base plate 232b Horizontal flange D1 Arrow (first direction)
D2 arrow (second direction)
Et Entrance H Building IW Lead-in wall U Building unit (frame structure)

Claims (8)

A reinforcing structure for a building in which a frame structure is formed by beams and pillars,
The upper edge of the framework structure includes a pair of first ceiling beams arranged substantially parallel in a first direction and a pair of ceiling beams arranged substantially parallel in a second direction substantially orthogonal to the first direction. is formed by the second ceiling beam of
Between the first ceiling beams, a plurality of ceiling joist members arranged along the second direction are spanned at intervals in the first direction,
A third beam member is provided in parallel with the ceiling joist member,
A reinforcing beam joined to the second ceiling beam by a connecting fitting and joined to the third beam member by an end joint fitting ,
The reinforcement structure of the building , wherein the reinforcing beam is provided at a lower position than the member to be joined by the end joint fitting . A reinforcing structure for a building in which a frame structure is formed by beams and pillars,
The upper edge of the framework structure includes a pair of first ceiling beams arranged substantially parallel in a first direction and a pair of ceiling beams arranged substantially parallel in a second direction substantially orthogonal to the first direction. is formed by the second ceiling beam of
Between the first ceiling beams, a plurality of ceiling joist members arranged along the second direction are spanned at intervals in the first direction,
A reinforcing beam joined to the second ceiling joist by a connecting fitting and joined to the ceiling joist member by an end joining fitting ,
The reinforcement structure of the building , wherein the reinforcing beam is provided at a lower position than the member to be joined by the end joint fitting . A reinforcing structure for a building in which a frame structure is formed by beams and pillars,
The upper edge of the framework structure includes a pair of first ceiling beams arranged substantially parallel in a first direction and a pair of ceiling beams arranged substantially parallel in a second direction substantially orthogonal to the first direction. is formed by the second ceiling beam of
Between the first ceiling beams, a plurality of ceiling joist members arranged along the second direction are spanned at intervals in the first direction,
A third beam member is provided in parallel with the ceiling joist member,
A reinforcing beam joined to the second ceiling beam by a connecting fitting and joined to the third beam member by an end joint fitting,
The reinforcing structure of the building, wherein the connection fitting is joined to the beam flange portion of the second ceiling beam. A reinforcing structure for a building in which a frame structure is formed by beams and pillars,
The upper edge of the framework structure includes a pair of first ceiling beams arranged substantially parallel in a first direction and a pair of ceiling beams arranged substantially parallel in a second direction substantially orthogonal to the first direction. is formed by the second ceiling beam of
Between the first ceiling beams, a plurality of ceiling joist members arranged along the second direction are spanned at intervals in the first direction,
A reinforcing beam joined to the second ceiling joist by a connecting fitting and joined to the ceiling joist member by an end joining fitting,
The reinforcing structure of the building, wherein the connection fitting is joined to the beam flange portion of the second ceiling beam. A reinforcing structure for a building in which a frame structure is formed by beams and pillars,
The upper edge of the framework structure includes a pair of first ceiling beams arranged substantially parallel in a first direction and a pair of ceiling beams arranged substantially parallel in a second direction substantially orthogonal to the first direction. is formed by the second ceiling beam of
Between the first ceiling beams, a plurality of ceiling joist members arranged along the second direction are spanned at intervals in the first direction,
A third beam member is provided in parallel with the ceiling joist member,
A reinforcing beam joined to the second ceiling beam by a connecting fitting and joined to the third beam member by an end joint fitting,
The end joint metal fitting is a reinforcing structure of a building joined to the upper surface of a member to be jointed. A reinforcing structure for a building in which a frame structure is formed by beams and pillars,
The upper edge of the framework structure includes a pair of first ceiling beams arranged substantially parallel in a first direction and a pair of ceiling beams arranged substantially parallel in a second direction substantially orthogonal to the first direction. is formed by the second ceiling beam of
Between the first ceiling beams, a plurality of ceiling joist members arranged along the second direction are spanned at intervals in the first direction,
A reinforcing beam joined to the second ceiling joist by a connecting fitting and joined to the ceiling joist member by an end joining fitting,
The end joint metal fitting is a reinforcing structure of a building joined to the upper surface of a member to be jointed. A reinforcing structure for a building in which a frame structure is formed by beams and pillars,
The upper edge of the framework structure includes a pair of first ceiling beams arranged substantially parallel in a first direction and a pair of ceiling beams arranged substantially parallel in a second direction substantially orthogonal to the first direction. is formed by the second ceiling beam of
Between the first ceiling beams, a plurality of ceiling joist members arranged along the second direction are spanned at intervals in the first direction,
A third beam member is provided in parallel with the ceiling joist member,
A reinforcing beam joined to the second ceiling beam by a connecting fitting and joined to the third beam member by an end joint fitting,
In the reinforcing structure of the building, the connecting fittings and the end joining fittings can be engaged with the second ceiling joist and the member to be joined at different heights in the vertical direction and can be temporarily installed. A reinforcing structure for a building in which a frame structure is formed by beams and pillars,
The upper edge of the framework structure includes a pair of first ceiling beams arranged substantially parallel in a first direction and a pair of ceiling beams arranged substantially parallel in a second direction substantially orthogonal to the first direction. is formed by the second ceiling beam of
Between the first ceiling beams, a plurality of ceiling joist members arranged along the second direction are spanned at intervals in the first direction,
A reinforcing beam joined to the second ceiling joist by a connecting fitting and joined to the ceiling joist member by an end joining fitting,
In the reinforcing structure of the building, the connecting fittings and the end joining fittings can be engaged with the second ceiling joist and the member to be joined at different heights in the vertical direction and can be temporarily installed.

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