Double ceiling suspension structure

Abstract

To provide a means for a double ceiling suspension structure with a simple structure and good workability. [Solution] In a double ceiling suspension structure, a beam (2) supports a first suspension bolt (4), the first suspension bolt (4) supports a first soffit support (5) and a connecting hardware (8), the first soffit support (5) supports a first soffit (6), the first soffit (6) supports a first ceiling board (7), the connecting hardware (8) supports a second suspension bolt (9) below the first ceiling board (7), the second suspension bolt (9) supports a second soffit support (10), the second soffit support (10) supports a second soffit (11), and the second soffit (11) supports a second ceiling board (12). A first joint (7a) of the first ceiling board (7) is located directly below the first suspension bolt (4). A first nut portion (8a) of the connecting hardware (8) screws onto the first suspension bolt (4). A plate portion (8b) of the connecting hardware (8) is supported by the first nut portion (8a) so as to be rotatable about a vertical axis, and is located in the first joint (7a) of the first ceiling board (7).

Description

[Technical Field]

[0001] The present invention relates to a double ceiling suspension structure. [Background technology]

[0002] In the ceiling structure disclosed in Patent Document 1, long steel suspension members are placed horizontally below building beams that are arranged parallel to and spaced apart via suspension bolts, in a direction perpendicular to the beams. Furthermore, the upper ends of ceiling panel suspension rails are directly fixed to the suspension steel members, and ceiling panels are fixed to the ceiling panel suspension rails. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-102669 Summary of the Invention [Problem to be solved by the invention]

[0004] In the clean room ceiling structures described in the above-mentioned prior art, the weight of the ceiling panels and filters is entirely applied to the suspension steel. This makes the suspension steel susceptible to deformation and requires the use of highly rigid materials. Furthermore, the longitudinal direction of the ceiling panel suspension rails and the direction of the ceiling panel joints must be precisely aligned.

[0005] An object of the present invention is to provide a double ceiling suspension structure that is simple in structure and easy to install. [Means for solving the problem]

[0006] (1) A double ceiling suspension structure according to the present invention comprises a beam, a first suspension bolt supported by the beam, and a first soffit support supported by the first suspension bolt. The double ceiling suspension structure according to the present invention further comprises a first soffit supported by the first soffit support and a first ceiling board supported by the first soffit. The double ceiling suspension structure according to the present invention further comprises a connecting hardware supported by the first suspension bolt below the first soffit support and above the first ceiling board. The double ceiling suspension structure according to the present invention further comprises a second suspension bolt supported by the connecting hardware below the first ceiling board. The double ceiling suspension structure according to the present invention further comprises a second soffit support supported by the second suspension bolt. The double ceiling suspension structure according to the present invention further comprises a second soffit supported by the second soffit support and a second ceiling board supported by the second soffit. The joint of the first ceiling board is located directly below the first hanging bolt, and the connecting hardware has a first nut portion and a plate portion. The first nut portion is threadedly engaged with the first hanging bolt. The plate portion is supported by the first nut portion so as to be rotatable about a vertical axis, and is located at the joint of the first ceiling board.

[0007] With the above configuration, the double ceiling suspension structure is simple and easy to install.

[0008] (2) The plate portion may be supported by the first nut portion via a vibration-isolating material.

[0009] (3) The plate portion may be supported by the first nut portion via a bearing.

[0010] (4) The first nut portion may have a split nut portion and a bolt portion. The split nut portion may have a first nut piece and a second nut piece, each having a female thread surface that can be threaded onto half the circumference of the first hanging bolt and the bolt portion. The split nut portion may further have a fixing means for fixing the first nut piece and the second nut piece. The split nut portion may be fixed by the fixing means in a state in which the first nut piece and the second nut piece are threaded onto the entire circumference of the first hanging bolt and the bolt portion. The bolt portion may rotatably support the plate portion.

[0011] (5) The connecting hardware may further have a second nut portion fixed below the plate portion, and the second suspension bolt may be threaded into the second nut portion.

[0012] (6) The second suspension bolt may be fixed to a lower portion of the plate portion. [Effects of the Invention]

[0013] According to the present invention, a double ceiling suspension structure can be provided that is simple in structure and easy to install. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a cross-sectional perspective view of a double ceiling suspension structure 1. [Figure 2] Fig. 2(A) is an external perspective view showing the first soffit support 5 with the first soffit support 14 attached and the first soffit 6. Fig. 2(B) is an external perspective view showing the first soffit support 5 and the first soffit 6 connected by the first soffit support 14. [Figure 3] FIG. 3 is a perspective view of the appearance of the connecting hardware 8. As shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view of the connecting hardware 8 taken along line AA in FIG. [Figure 5]Fig. 5(a) is a diagram showing the first nut 5d screwed onto the first hanging bolt 4 and the first washer 5e temporarily inserted. Fig. 5(b) is a diagram showing the first soffit support 5 positioned on the first hanging bolt 4. Fig. 5(c) is a diagram showing the first soffit support 5 fixed by screwing the first washer 5e, the first nut 5d, and the first nut portion 8a of the connecting hardware 8 onto the first hanging bolt 4. Fig. 5(d) is a diagram showing the first soffit support 6 attached to the first soffit support 5. [Figure 6] Fig. 6(a) is a diagram showing the orientation of the plate portion 8b and the second nut portion 8c changed. Fig. 6(b) is a diagram showing the first ceiling board 7 attached. Fig. 6(c) is a diagram showing the second nut portion 8c screwed onto the second hanging bolt 9. [Figure 7] Fig. 7(a) is a diagram showing the third nut 10d screwed onto the second hanging bolt 9 and the third washer 10e temporarily inserted. Fig. 7(b) is a diagram showing the second sill support 10 positioned on the second hanging bolt 9. Fig. 7(c) is a diagram showing the second sill support 10 fixed by temporarily inserting the fourth washer 10f onto the second hanging bolt 9 and screwing in the fourth nut 10g. [Figure 8] FIG. 8 is a cross-sectional view of a connecting hardware 8 according to a modified example. [Figure 9] FIG. 9 is a cross-sectional view of a connecting hardware 8 according to a modified example. [Figure 10] FIG. 10 is a cross-sectional view of a connecting hardware 8 according to a modified example. [Figure 11] FIG. 11 is an external perspective view of a split nut portion 8n according to a modified example. [Figure 12] FIG. 12 is a cross-sectional view of a connecting hardware 8 according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the double ceiling suspension structure according to the present invention will be described in detail. Note that the following embodiment is merely an example of the present disclosure, and it goes without saying that the embodiment can be modified as appropriate without departing from the gist of the present disclosure.

[0016] [Configuration of double ceiling suspension structure 1] As shown in Figure 1, the double ceiling suspension structure 1 includes a beam 2, a mounting member 3, a first suspension bolt 4, a first soffit support 5, a first soffit 6, a first ceiling board 7, and a connecting hardware 8. The double ceiling suspension structure 1 further includes a second suspension bolt 9, a second soffit support 10, a second soffit 11, and a second ceiling board 12.

[0017] Although not shown in the figure, the double ceiling suspension structure 1 is installed in a multi-story building made of light steel. The framework of a multi-story building comprises a foundation, multiple columns, multiple girders, multiple beams 2, a bottom structural part, an intermediate structural part between the upper and lower floors, and a top structural part. The intermediate structural part is the floor slab of the upper floor and the ceiling slab of the lower floor. The girders and beams 2 support the intermediate structural part and the top structural part. Both ends of the girders are connected to the columns. Beams 2 are so-called small beams, and multiple beams are arranged parallel to each other, each connected to a main beam at both ends.

[0018] In a double ceiling suspension structure 1, first suspension bolts 4 are attached to beams 2 with mounting members 3, and first siding support 5 and first siding 6 are suspended from the first suspension bolts 4. A first ceiling board 7 is attached to the first siding 6. Compared to a single ceiling, the double ceiling suspension structure 1 increases the air space between the residential and commercial spaces and the ceiling slab, improving sound insulation against noise and vibration from upper floors. In addition, placing piping and wiring within the ceiling pocket improves aesthetics and makes effective use of space.

[0019] The multiple beams 2 are H-shaped steel beams made of lightweight steel plates. In FIG. 1, the beams 2 extend in a direction perpendicular to the plane of the paper. The beams 2 have an upper flange 2a, a web 2b, and a lower flange 2c. The upper flange 2a and the lower flange 2c are horizontal plate-like portions. The web 2b is a vertical plate-like portion that connects the upper flange 2a and the lower flange 2c. A first suspension bolt 4 is attached to the lower flange 2c by an attachment member 3.

[0020] The mounting member 3 includes a main body 3a, a beam screw 3b, a first hanging bolt 4, and two sill support nuts 3c. The main body 3a has a first horizontal portion 3d, a second horizontal portion 3e, a third horizontal portion 3f, a first vertical portion 3g, and a second vertical portion (not shown). The first horizontal portion 3d, the second horizontal portion 3e, and the third horizontal portion 3f are all rectangular plate-like portions that extend horizontally. The first horizontal portion 3d, the second horizontal portion 3e, and the third horizontal portion 3f are parallel to one another. The first horizontal portion 3d, the third horizontal portion 3f, and the second horizontal portion 3e are arranged in this order from top to bottom.

[0021] The first horizontal portion 3d and the third horizontal portion 3f extend further away from the lower flange 2c than the second horizontal portion 3e. The end faces of the first horizontal portion 3d, the second horizontal portion 3e, and the third horizontal portion 3f facing the beam 2 are at the same position when viewed from above. The first horizontal portion 3d has a first sill receiving hole (not shown). The second horizontal portion 3e has a beam screw hole 3h. The third horizontal portion 3f has a second sill receiving hole (not shown).

[0022] The first soffit receiving hole and the second soffit receiving hole are in overlapping positions when viewed from above. The first hanging bolt 4 can be inserted into the first soffit receiving hole and the second soffit receiving hole. The inner surface of the beam screw hole 3h is female threaded, and the beam screw 3b can be screwed into the beam screw hole 3h. The beam screw hole 3h is spaced apart from the first soffit receiving hole and the second soffit hole when viewed from above.

[0023] The first vertical portion 3g and the second vertical portion are both rectangular plate-like portions. The first vertical portion 3g extends in the vertical direction and connects one end of the first horizontal portion 3d to one end of the second horizontal portion 3e. The second vertical portion extends in the vertical direction and connects the other end of the first horizontal portion 3d to the other end of the second horizontal portion 3e. The first vertical portion 3g and the second vertical portion each have a fixing groove 3j that opens toward the lower flange 2c. The fixing groove 3j has a horizontal portion that extends horizontally from its opening toward the lower flange 2c in a direction away from the lower flange 2c.

[0024] The beam screw hole 3h of the second horizontal portion 3e is positioned so as to overlap with the fixing groove 3j in a top view. The first soffit receiving hole of the first horizontal portion 3d and the second soffit receiving hole of the third horizontal portion 3f are positioned farther away from the fixing groove 3j when viewed from the bottom flange 2c. In other words, the beam screw 3b threaded into the beam screw hole 3h is positioned so as to overlap with the fixing groove 3j in a top view. The first hanging bolt 4 threaded into the first soffit receiving hole and the second soffit receiving hole is not positioned so as to overlap with the fixing groove 3j in a top view.

[0025] The mounting member 3 is fixed to the beam 2 as follows. In the vertical direction, the width of the horizontal portion of the fixing groove 3j is greater than the width of the lower flange 2c, allowing the lower flange 2c to be inserted into the horizontal portion. The lower flange 2c is inserted into the fixing groove 3j, for example, until it abuts against the end face at the back of the horizontal portion of the fixing groove 3j. In this state, the beam screw 3b is threaded and fastened into the beam screw hole 3h of the second horizontal portion 3e, causing the tip of the shank of the beam screw 3b to abut against the underside of the lower flange 2c. The beam screw 3b is fastened until the top surface of the lower flange 2c is pressed against the top surface of the horizontal portion. In this way, the beam screw 3b cooperates with the fixing groove 3j to fix the main body 3a to the beam 2.

[0026] The first hanging bolt 4 is a so-called stud bolt. The first hanging bolt 4 is fixed to the mounting member 3 with the mounting member 3 fixed to the beam 2. One of the two sill support nuts 3c is threaded onto the first hanging bolt 4 above the first horizontal portion 3d and is pressed against the upper surface of the first horizontal portion 3d by the load of the first hanging bolt 4. The other sill support nut 3c is threaded onto the first hanging bolt 4 below the third horizontal portion 3f and is pressed against the lower surface of the third horizontal portion 3f. In this way, the first hanging bolt 4 is supported by the beam 2 via the mounting member 3 while extending in the vertical direction.

[0027] In the double ceiling suspension structure 1, a plurality of first soffit supports 5 are arranged parallel to the beams 2. Figures 1 and 2 show one of the plurality of first soffit supports 5. In Figure 1, the first soffit support 5 extends in a direction perpendicular to the plane of the paper. The single first soffit support 5 is supported by a plurality of first suspension bolts 4 and extends below the beams 2, parallel to the beams 2.

[0028] As shown in Figures 1 to 4, the first sill support 5 is a longitudinal channel steel. The first sill support 5 includes a first flange 5a, a second flange 5c, and a first web 5b. The first flange 5a and the second flange 5c are parallel plate-like portions extending along the longitudinal direction. The first web 5b extends along the longitudinal direction and connects the end of the first flange 5a to the end of the second flange 5c.

[0029] The first flange 5a has first through holes 5h spaced apart along the longitudinal direction. The first suspension bolt 4 is inserted through the first through hole 5h. The first nut 5d is threaded onto the first suspension bolt 4 above the first through hole 5h and is pressed against the first flange 5a from above, sandwiching a first washer 5e between them. The second nut 5g is threaded onto the first suspension bolt 4 below the first through hole 5h and is pressed against the first flange 5a from below, sandwiching a second washer 5f between them. The first nut 5d and the second nut 5g sandwich the first flange 5a from above and below, securing it to the first suspension bolt 4.

[0030] Since the first hanging bolt 4 is fixed to the main body 3 a, the main body 3 a supports the first sill support 5 via the first hanging bolt 4.

[0031] The second flange 5c has second through holes 5i formed at intervals along the longitudinal direction. The second through holes 5i are located so as to overlap the first through holes 5h in a top view. The first hanging bolt 4 is inserted through the second through hole 5i. The first nut portion 8a of the connecting hardware 8 is threaded onto the first hanging bolt 4 below the second flange 5c. The first soffit support 5 supports the first soffit 6 via the first soffit support 14.

[0032] The first siding 6 is a long tubular member with a rectangular cross section. When viewed from above, the first siding 6 is positioned so as not to overlap with the connecting hardware 8. In the double ceiling suspension structure 1, multiple first sidings 6 are arranged in parallel. When viewed from above, the first sidings 6 and the first siding support 5 are perpendicular to each other. Figure 1 shows one of the multiple first sidings 6. In Figure 1, the first siding 6 extends left and right on the page.

[0033] The first siding 6 has plate-shaped first and second contact portions 6a and 6b, and plate-shaped first and second mounting portions 6c and 6d. As shown in FIG. 2, the first siding 6 has a rectangular cross section. In the rectangular cross section, the first contact portion 6a is located at the top. The first contact portion 6a is divided into two parts at the center in a cross direction perpendicular to the extension direction. One part is the first contact portion 6a1, and the other part is the second contact portion 6a2.

[0034] The second contact portion 6b is located on the lower side. The second contact portion 6b is divided into two parts at the center in the intersecting direction perpendicular to the extension direction. One part is the third contact portion 6b1, and the other part is the fourth contact portion 6b2. The first attachment portion 6c is located on the left side of the paper. The second attachment portion 6d is located on the right side of the paper.

[0035] The first contact portion 6a contacts the second flange 5c of the first sill support 5. A first locking groove 6e is formed in the outer surface of the first mounting portion 6c along the longitudinal direction. A second locking groove 6f is formed in the outer surface of the second mounting portion 6d along the longitudinal direction.

[0036] The first soffit support 14 comprises a plate-shaped first support body 14a, two plate-shaped first soffit mounting portions 14b, and two hook-shaped first soffit support mounting portions 14c. The two first soffit mounting portions 14b protrude downward from both ends of the first support body 14a. The overall shape of the first support body 14a and the two first soffit mounting portions 14b is groove-shaped. The first soffit mounting portion 14b has a first protrusion 14d that protrudes inward. When the first abutment portion 6a abuts against the first support body 14a, the first protrusion 14d engages with the first locking groove 6e and the second locking groove 6f, securing the first soffit 6 to the first soffit support 14.

[0037] The two first soffit support mounting portions 14c protrude from the first support body 14a in the opposite direction to the first soffit support mounting portion 14b protruding from the first support body 14a. Each first soffit support mounting portion 14c is hook-shaped. By inserting the second flange 5c between each first soffit support mounting portion 14c and the first support body 14a, the first soffit support mounting portion 14c can engage with the second flange 5c. In this way, the first soffit support 14 is fixed to the first soffit support 5, and as a result, the first soffit 6 is fixed to the first soffit support 5.

[0038] The first ceiling board 7 is a flat member. The first ceiling board 7 is rectangular in top view. The material of the first ceiling board 7 is not particularly limited; for example, the first ceiling board 7 may be gypsum board or plywood. The first ceiling board 7 is fixed and supported to the second abutment portion 6b of the first rough joist 6 using screws. In the double ceiling suspension structure 1, multiple first ceiling boards 7 are arranged adjacent to each other in the direction perpendicular to the plane of the paper in Figure 1 and in the left-right direction, in other words, horizontally.

[0039] The location where the first ceiling boards 7 are adjacent to each other is called the first joint 7a. The first ceiling boards 7 are arranged so that the first joint 7a is located directly below the first hanging bolt 4. The first joint 7a of the first ceiling board 7 may be located not only directly below the first hanging bolt 4 but also in a location other than directly below the first hanging bolt 4. Furthermore, the multiple first ceiling boards 7 are arranged so that they are all the same height and flush with each other. The first layer of the ceiling is made up of the horizontally arranged first ceiling boards 7.

[0040] As shown in Figures 3 and 4, the connecting hardware 8 has a first nut portion 8a, a plate portion 8b, and a second nut portion 8c. The first nut portion 8a has a hexagonal prism-shaped exterior, a first female thread 8d at its upper portion, and a bearing portion 8f and a cap portion 8g at its lower portion. The plate portion 8b has a bearing portion 8h, a shaft portion 8i, and a plate-shaped portion 8j. The second nut portion 8c has a hexagonal prism-shaped exterior, and a second female thread 8e that opens to its lower surface.

[0041] The first female screw 8d screws into the first hanging bolt 4, and the upper part of the first nut portion 8a is pressed from below against the first soffit support 5. In this state, the connecting hardware 8 is supported by the first hanging bolt 4 below the first soffit support 5 and above the first ceiling board 7.

[0042] The bearing portion 8f is a so-called sliding bearing and supports the supported portion 8h so as to be rotatable about the axis 8z. The cap portion 8g has a third through hole 8y in its center. The third through hole 8y of the cap portion 8g has a smaller diameter than the supported portion 8h but a larger diameter than the shaft portion 8i. The cap portion 8g supports the outer periphery of the supported portion 8h. The shaft portion 8i is inserted into the third through hole 8y of the cap portion 8g.

[0043] The vertical size of the plate portion 8b is equal to or greater than the thickness of the first ceiling board 7. The plate portion 8b is supported by the first nut portion 8a so as to be rotatable about an axis 8z. The axis 8z coincides with the axis of the first hanging bolt 4. The first joint 7a of the first ceiling board 7 is located directly below the first hanging bolt 4. Therefore, the axis 8z passes through the first joint 7a of the first ceiling board 7, so the plate portion 8b can rotate to a position that aligns with the first joint 7a of the first ceiling board 7.

[0044] The second female screw 8e screws into the second suspension bolt 9. In this embodiment, the plate portion 8b and the second nut portion 8c are cast as a single piece and then the female screw is machined. The plate portion 8b and the second nut portion 8c may be separate pieces. When the plate portion 8b and the second nut portion 8c are separate pieces, the plate portion 8b and the second nut portion 8c can be fixed together by welding, for example.

[0045] The second suspension bolt 9 is a so-called stud bolt. The second suspension bolt 9 is threadedly engaged with the second female thread 8e of the connecting hardware 8. By this threaded engagement, the second suspension bolt 9 is supported by the second nut portion 8c below the first ceiling board 7.

[0046] In the double ceiling suspension structure 1, multiple second joist supports 10 are arranged in parallel. In this embodiment, the second joist supports 10 are also parallel to the first joist supports 5. Figure 1 shows one of the multiple second joist supports 10. In Figure 1, the second joist support 10 extends in a direction perpendicular to the plane of the paper. The second joist support 10 is arranged in parallel to the beams 2.

[0047] The second soffit support 10 is a longitudinal channel steel. The second soffit support 10 includes a third flange 10a, a fourth flange 10c, and a second web 10b. The third flange 10a and the fourth flange 10c are parallel plate-like portions extending along the longitudinal direction. The second web 10b extends along the longitudinal direction and connects the end of the third flange 10a to the end of the fourth flange 10c.

[0048] The third flange 10a has fourth through holes 10h spaced apart along the longitudinal direction. The second suspension bolt 9 is inserted through the fourth through hole 10h. The third nut 10d is threaded onto the second suspension bolt 9 above the fourth through hole 10h and is pressed against the third flange 10a from above, sandwiching the third washer 10e between them. The fourth nut 10g is threaded onto the second suspension bolt 9 below the fourth through hole 10h and is pressed against the third flange 10a from below, sandwiching the fourth washer 10f between them. The third nut 10d and the fourth nut 10g sandwich the third flange 10a from above and below, securing it to the second suspension bolt 9.

[0049] Since the second hanging bolt 9 is fixed to the connecting hardware 8, the first hanging bolt 4 supports the second sill support 10 via the connecting hardware 8 and the second hanging bolt 9.

[0050] The second sill 11 is a long tubular member with a rectangular cross section. In the double ceiling suspension structure 1, multiple second sills 11 are arranged in parallel. When viewed from above, the second sill 11 is perpendicular to the first sill support 5 and the second sill support 10. Figure 1 shows one of the multiple second sills 11. In Figure 1, the second sill 11 extends in the left-right direction of the paper.

[0051] As shown in FIG. 1, the second siding 11 has plate-shaped third and fourth contact portions 11a and 11b, a plate-shaped third mounting portion 11c, and a fourth mounting portion (not shown). Similar to the first siding 6, the second siding 11 has a rectangular cross section. In the rectangular cross section, the third contact portion 11a is located at the top. The fourth contact portion 11b is located at the bottom. The third mounting portion 11c is located on the left.

[0052] The fourth mounting portion 11d is located on the right. The third abutment portion 11a abuts against the fourth flange 10c of the second sill support 10. A third locking groove (not shown) is formed on the outer surface of the third mounting portion 11c along the longitudinal direction. The fourth mounting portion 11d has a fourth locking groove (not shown) on the outer surface along the longitudinal direction.

[0053] The second soffit support 15 has a similar configuration to the first soffit support 14. The second soffit support 15 comprises a plate-shaped second support body 15a, two plate-shaped second soffit mounting portions 15b, and two hook-shaped second soffit support mounting portions 15c. The two second soffit mounting portions 15b protrude downward from both ends of the second support body 15a. The overall shape of the second support body 15a and the two second soffit mounting portions 15b is groove-shaped. The second soffit mounting portions 15b have a second protrusion 15d that protrudes inward.

[0054] With the third abutment portion 11a abutting against the second support body 15a, the second protrusion 15d engages with the third locking groove, securing the second soffit 11 to the second soffit support 15. The two second soffit support mounting portions 15c protrude from the second support body 15a in the opposite direction to the direction in which the second soffit mounting portion 15b protrudes from the second support body 15a. Each second soffit support mounting portion 15c is hook-shaped. By inserting the fourth flange 10c between each second soffit support mounting portion 15c and the second support body 15a, the second soffit support mounting portion 15c can engage with the fourth flange 10c. In this way, the second soffit support 15 is secured to the second soffit support 10, thereby securing the second soffit 11 to the second soffit support 10.

[0055] The second ceiling board 12 is a flat member. The second ceiling board 12 is rectangular in top view. The material of the second ceiling board 12 is not particularly limited; for example, the second ceiling board 12 may be gypsum board or plywood. The second ceiling board 12 is fixed to and supported by the fourth abutment portion 11b of the second joist 11. In the double ceiling suspension structure 1, multiple second ceiling boards 12 are arranged adjacent to each other in the direction perpendicular to the plane of the paper in FIG. 1 and in the left-right direction, in other words, horizontally.

[0056] The area where the second ceiling boards 12 are adjacent to each other is called the second joint 12a. The second joint 12a of the second ceiling board 12 does not necessarily have to be located directly below the second hanging bolt 9. The multiple second ceiling boards 12 are arranged at the same height and flush with each other. The horizontally arranged second ceiling boards 12 form the second layer of the ceiling.

[0057] [Construction method for double ceiling suspension structure 1] The construction method for the double ceiling suspended structure 1 includes a first step of constructing the first layer of the ceiling and a second step of constructing the second layer of the ceiling.

[0058] [1st step] The first step includes steps 11 to 17. In step 11, the mounting member 3 is fixed to the beam 2. In step 12, the first hanging bolt 4 is fixed to the mounting member 3. In step 13, a first nut 5d and a first washer 5e are attached to the first hanging bolt 4. In step 14, the first sill support 5 is attached to the first hanging bolt 4.

[0059] In the 15th step, the connecting hardware 8 is attached to the first hanging bolt 4. In the 16th step, the first soffit support 14 is attached to the first soffit support 5, and the first soffit 6 is attached to the first soffit support 14. In the 17th step, the first ceiling board 7 is attached to the first soffit 6.

[0060] In the eleventh step, the mounting member 3 is fixed to the lower flange 2c. For this purpose, the lower flange 2c of the beam 2 is inserted into the fixing groove 3j of the mounting member 3. The beam screw 3b is screwed into the beam screw hole 3h of the mounting member 3, and the tip of the beam screw 3b is pressed against the lower flange 2c.

[0061] In the twelfth step, the first suspension bolt 4 is fixed to the main body 3a of the mounting member 3. Therefore, with the mounting member 3 fixed to the bottom flange 2c of the beam 2, the first suspension bolt 4 is passed through the first and second soffit receiving holes of the mounting member 3. With the first suspension bolt 4 passed through the first and second soffit receiving holes, one of the two soffit receiving nuts 3c is screwed onto the first suspension bolt 4 above the first horizontal portion 3d. Below the first horizontal portion 3d, the other soffit receiving nut 3c is screwed onto the first suspension bolt 4.

[0062] 5(a), in the thirteenth step, the first suspension bolt 4 is threaded into the first nut 5d, and the first nut 5d is moved to a position higher than the fixed position of the first sill support 5. The first suspension bolt 4 is inserted into the first washer 5e and moved to a position where it abuts against the first nut 5d.

[0063] In the fourteenth step, as shown in FIG. 5(b), the first hanging bolt 4 is inserted into the first through-hole 5h of the first flange 5a of the first sill support 5. The first hanging bolt 4 is not inserted into the second through-hole 5i of the first flange 5a of the first sill support 5. In this state, the first hanging bolt 4 is inserted into the second washer 5f, and further, the second nut 5g is screwed onto the first hanging bolt 4 below the second washer 5f. The screwing position of the second nut 5g is moved, and the first hanging bolt 4 is inserted into the second through-hole 5i of the first flange 5a of the first sill support 5.

[0064] In the fifteenth step, as shown in Figure 5(c), the first nut 5d and the second nut 5g are moved to a screwing position where they clamp and secure the first flange 5a. The weight of the first soffit support 5 presses the first flange 5a against the second nut 5g. Once the first soffit support 5 is positioned in this way, the first nut 5d is tightened so that it presses against the first flange 5a. The first female thread 8d of the first nut portion 8a of the connecting hardware 8 is threaded onto the first hanging bolt 4 and presses against the second flange 5c of the first soffit support from below.

[0065] In the 16th step, as shown in Figure 5(d), the first soffit support mounting portion 14c of the first soffit support 14 is engaged with the second flange 5c of the first soffit support 5. The first soffit 6 is engaged with the first locking groove 6e and the second locking groove 6f of the first soffit support 14's first protrusion 14d. The first abutment portion 6a abuts against the second flange 5c of the first soffit support 5 from below.

[0066] In the 17th step, as shown in FIG. 6(a), the plate portion 8b of the connecting hardware 8 is rotated so that it fits into the first joint 7a of the first ceiling board 7. The first joint 7a of the first ceiling board 7 extends in the length direction of the first soffit support 5. Therefore, the width direction of the plate portion 8b is oriented in the length direction of the first soffit support 5. The plate portion 8b rotates integrally with the second nut portion 8c. The width direction of the plate portion 8b is perpendicular to both the rotation axis direction of the plate portion 8b and the thickness direction of the plate portion 8b.

[0067] As shown in Figure 6(b), the first ceiling board 7 is inserted between the first joist 6 and the second nut portion 8c of the connecting hardware 8, and is positioned so that the plate portion 8b of the connecting hardware 8 is sandwiched between the first ceiling boards 7. Once positioned, the first ceiling board 7 is attached to the first joist 6 using screws.

[0068] [Second process] The second step includes steps 21 to 23. In step 21, the second hanging bolt 9 is attached to the second female screw 8e of the second nut portion 8c of the connecting hardware 8. In step 22, the second soffit support 10 is attached to the second hanging bolt 9. In step 23, the second soffit support 15 is attached to the second soffit support 10, the second soffit 11 is attached to the second soffit support 15, and the second ceiling board 12 is attached to the second soffit 11.

[0069] In the 21st step, as shown in Fig. 6(c), the second suspension bolt 9 is screwed into the second female thread 8e of the second nut portion 8c of the connecting hardware 8. As a result, the second suspension bolt 9 is supported by the first suspension bolt 4 via the connecting hardware 8.

[0070] In step 22, as shown in Fig. 7(a), a third nut 10d is threaded onto the second hanging bolt 9, and the second hanging bolt 9 is moved above the fixed position of the second soffit support 10. Next, as shown in Fig. 7(b), a third washer 10e, a fourth through hole 10h in the third flange 10a of the second soffit support 10, and a fourth washer 10f are temporarily inserted onto the second hanging bolt 9 in that order. A fourth nut 10g is threaded onto the second hanging bolt 9 below the fourth washer 10f, and the fourth washer 10f is brought into contact with the second soffit support 10 from below.

[0071] Once the second sill support 10 is positioned, as shown in Figure 7(c), the third nut 10d is tightened downward so that the third washer 10e presses against the second sill support 10 from above. This fixes the second sill support 10.

[0072] In the 23rd step, the second soffit support mounting portion 15c of the second soffit support 15 is engaged with the fourth flange 10c of the second soffit support 10. The second soffit 11 has its third and fourth locking grooves engaged with the second protrusion 15d of the second soffit support 15. The third abutment portion 11a abuts against the fourth flange 10c of the second soffit support 10 from below. Furthermore, the second ceiling board 12 is attached to the fourth abutment portion 11b of the second soffit 11.

[0073] [Effects of the embodiment] (1) According to the above embodiment, the first hanging bolt 4 supports the second hanging bolt 9, the second soffit support 10, the second soffit 11, and the second ceiling board 12 via the connecting hardware 8. The loads of the connecting hardware 8, the second hanging bolt 9, the second soffit support 10, the second soffit 11, and the second ceiling board 12 are not applied to the first soffit support 5. Therefore, the first soffit support 5 is less likely to deform, and there is no need to use a highly rigid material for the first soffit support 5, which increases the durability of the two-story ceiling hanging structure and reduces costs.

[0074] (2) The first nut portion 8a of the connecting hardware 8 screws onto the first hanging bolt 4, and the plate portion 8b is located in the first joint 7a of the first ceiling board 7. Furthermore, the second nut portion 8c screws onto the second hanging bolt 9. Therefore, there is no need to drill bolt holes in the first ceiling board 7. Also, there is no need to lift the first ceiling board 7 with the hanging bolt inserted into the bolt hole in the first ceiling board 7. Therefore, the two-layer ceiling hanging structure can be simplified, which improves the ease of construction of the two-layer ceiling and reduces the amount of work required.

[0075] (3) The first nut portion 8a and the plate portion 8b of the connecting hardware 8 can rotate independently of each other. The first nut portion 8a is fixed by threading onto the first hanging bolt 4, with the upper portion of the first nut portion 8a abutting against the lower portion of the first soffit support 5. With the first nut portion 8a fixed, the plate portion 8b can rotate to a position that matches the first joint 7a of the first ceiling board 7. Therefore, the first hanging bolt 4 above the first ceiling board 7 and the second hanging bolt 9 below the first ceiling board 7 can be connected without drilling bolt holes in the first ceiling board 7.

[0076] (4) The plate portion 8b of the connecting hardware 8 is located at the first joint 7a of the first ceiling board 7. In contrast to this arrangement, the plate portion 8b of the connecting hardware 8 is not located at the second joint 12a of the second ceiling board 12. Therefore, the second joint 12a of the second ceiling board 12 can be spaced closer together than the first joint 7a of the first ceiling board 7, improving the aesthetic appearance of the ceiling. Because the first ceiling board 7 is blocked from view from inside the room by the second ceiling board 12, the aesthetic appearance is not affected even if the spacing of the first joints 7a is wider.

[0077] [Variations] (1) In the above-described embodiment, the first nut portion 8a may support the plate portion 8b rotatably about the axis 8z. As shown in FIG. 8, vibration-proofing material 8k may be disposed on the inner circumferential surface of the bearing portion 8f of the first nut portion 8a and on a portion of the upper surface of the cap portion 8g that does not face the bearing portion 8f. The vibration-proofing material 8k is an elastic material such as polyurethane, and the plate portion 8b is supported by the first nut portion 8a via the vibration-proofing material 8k. In this manner, even if noise and vibration from the upper floor propagate to the first nut portion 8a of the connecting hardware 8 via the first hanging bolt 4, they are not propagated to the plate portion 8b. Therefore, the vibration-proofing material 8k prevents the transmission of vibration, thereby improving the ceiling sound insulation performance.

[0078] (2) In the above embodiment, the bearing portion 8f of the first nut portion 8a is a sliding bearing. However, the following configuration may be used instead of this embodiment. That is, the plate portion 8b may be supported by the first nut portion 8a via a bearing. As shown in FIG. 9, the bearing may be a ball bearing 8m. Alternatively, a roller bearing or a needle bearing may be used instead of the ball bearing 8m. In this way, the rotation of the plate portion 8b relative to the first nut portion 8a is smoothed.

[0079] (3) In the above embodiment, an example has been described in which the first nut portion 8a is rotated about the axis 8z as the rotation center to thread onto the first suspension bolt 4. The embodiment may be replaced with the following. As shown in FIG. 10, the first nut portion 8a according to this modification has a split nut portion 8n and a bolt portion 8p. As shown in FIG. 11, the split nut portion 8n has a first nut piece 13a and a second nut piece 13b. The first nut piece 13a has a first female thread surface 13d, and the second nut piece 13b has a second female thread surface 13e.

[0080] The first female thread surface 13d and the second female thread surface 13e can be threaded onto half the circumference of the first hanging bolt 4 and the bolt portion 8p. The split nut portion 8n has a first engagement portion 13f and a second engagement portion 13g as a fixing means. The first engagement portion 13f and the second engagement portion 13g engage with each other to fix the first nut piece 13a and the second nut piece 13b. The split nut portion 8n further has a hinge portion 13c. The hinge portion 13c connects the first nut piece 13a and the second nut piece 13b so that they can rotate in the direction of arrow 13h. First, the first nut piece 13a and the second nut piece 13b are threaded onto the entire circumference of the first hanging bolt 4 and the bolt portion 8p.

[0081] Next, first engaging portion 13f and second engaging portion 13g are engaged to fix first suspension bolt 4, bolt portion 8p, and split nut portion 8n. Bolt portion 8p rotatably supports plate portion 8b. In this way, first nut portion 8a can be screwed onto first suspension bolt 4 without rotating first nut portion 8a, improving workability.

[0082] (4) In the above embodiment, an example was described in which the connecting hardware 8 has the second nut portion 8c. However, this embodiment may be replaced with the following. That is, as shown in FIG. 12, instead of the second nut portion 8c, the second suspension bolt 9 may be cast integrally with the plate portion 8b and then machined to have a male thread. In this way, if the second suspension bolt 9 is fixed to the lower portion of the plate portion 8b, the work of screwing the second suspension bolt 9 into the second nut portion 8c is not required. This improves workability.

[0083] (5) A lubricant may be interposed between the bearing portion 8f and the cap portion 8g of the first nut portion 8a and the supported portion 8h and the shaft portion 8i of the plate portion 8b. The use of a lubricant reduces frictional resistance between the bearing portion 8f and the cap portion 8g of the first nut portion 8a and the supported portion 8h and the shaft portion 8i of the plate portion 8b, improving workability.

[0084] (6) In the above embodiment, an example has been described in which stud bolts are used as the first suspension bolts 4 and the second suspension bolts 9. Alternatively, bolts other than stud bolts may be used as the first suspension bolts 4 and the second suspension bolts 9.

[0085] (7) Stainless steel or steel is suitable as the material for the connecting hardware 8 because it is highly durable and makes the connecting hardware 8 less likely to deform. Furthermore, if the second hanging bolt 9, second soffit support 10, second soffit 11, and second ceiling board 12 are lightweight, the load applied to the connecting hardware 8 will be small. For this reason, aluminum may be used as the material for the connecting hardware 8. Compared to stainless steel and steel, aluminum is lighter, which reduces the workload during installation.

[0086] (8) The first nut portion 8a, the second nut portion 8c, the first nut 5d, the third nut 10d, and the fourth nut 10g are all hexagonal nuts. If the first nut portion 8a, the second nut portion 8c, the first nut 5d, the third nut 10d, and the fourth nut 10g have the same dimensions, the same tools can be used to tighten the nuts. This eliminates the need to change tools, improving workability.

[0087] (9) In the above embodiment, an example has been described in which an H-shaped steel is used for the beam 2. However, an I-shaped steel may be used instead of the H-shaped steel. Since the I-shaped steel has a tapered surface at the flange, it is desirable that the fixing groove 3j of the mounting member 3 has a shape in which the surface facing the tapered surface at the flange is inclined.

[0088] (10) In the above embodiment, an example of applying the double ceiling suspension structure 1 to a multi-story building has been described, but this multi-story building may be an apartment building or a detached house. The multi-story building may be made of reinforced concrete or wood. The number of floors of a multi-story building is not particularly limited. The multi-story building may be made of heavy steel instead of light steel. If heavy steel is used, the number of columns and beams 2 can be reduced structurally, thereby increasing the flexibility of the floor plan.

[0089] On the other hand, if the number of beams 2 is reduced, the load applied to each hanging bolt to suspend the second ceiling board increases. Therefore, if the second hanging bolt 9 is connected to the first hanging bolt 4 using connecting hardware 8, the load of the second ceiling board, etc. is not applied to the first joist support 5, preventing deformation of the first joist support.

[0090] [Appendix 1] A beam, a first suspension bolt supported by the beam, a first soffit support supported by the first suspension bolt, a first soffit supported by the first soffit support, a first ceiling board supported by the first soffit, a connecting hardware supported by the first suspension bolt below the first soffit support and above the first ceiling board, a second suspension bolt supported by the connecting hardware below the first ceiling board, and a second soffit support supported by the second suspension bolt, A double ceiling hanging structure comprising a second soffit supported by the second soffit support and a second ceiling board supported by the second soffit, wherein the joint of the first ceiling board is located directly below the first hanging bolt, the connecting hardware has a first nut portion and a plate portion, the first nut portion is threaded onto the first hanging bolt, and the plate portion is supported by the first nut portion so as to be rotatable around a vertical axis, and is located at the joint of the first ceiling board.

[0091] [Appendix 2] A double ceiling suspension structure as described in Appendix 1, in which the plate portion is supported by the first nut portion via vibration-damping material.

[0092] [Appendix 3] A double ceiling suspension structure according to Appendix 1, in which the plate portion is supported by the first nut portion via a bearing.

[0093] [Appendix 4] The first nut portion has a split nut portion and a bolt portion, and the split nut portion has a first nut piece and a second nut piece each having a female thread surface that can be screwed onto half the circumference of the first hanging bolt and the bolt portion, and a fixing means for fixing the first nut piece and the second nut piece, and the first nut piece and the second nut piece are fixed by the fixing means in a state in which they are screwed onto the entire circumference of the first hanging bolt and the bolt portion, and the bolt portion rotatably supports the plate portion.A double ceiling hanging structure of Appendix 1.

[0094] [Appendix 5] A double ceiling suspension structure of Appendix 1, wherein the connecting hardware further has a second nut portion fixed below the plate portion, and the second suspension bolt is screwed into the second nut portion.

[0095] [Appendix 6] The second suspension bolt is fixed to the bottom of the plate portion in the double ceiling suspension structure of Appendix 1. [Explanation of symbols]

[0096] 1...Double ceiling suspension structure 2…Beam 3...Mounting material 4...First hanging bolt 5...First Noenuke 6...First veranda 7...First ceiling board 7a…1st joint 8...Connecting hardware 8a...First nut part 8b...Plate section 8c...Second nut part 8d...First female screw 8e...Second female thread 8f…Bearing part 8g...Cap part 8h…Beared part 8i…Shaft part 8j...Plate section 8k…Vibration isolation material 8m...ball bearing 8n...Split nut part 8p...Bolt section 8y…3rd through hole 9...Second hanging bolt 10...Second Noenuke 11...Second outdoor veranda 12...Second ceiling board 14...First sill support 15...Second sill support

Claims

1. Beams and a first suspension bolt supported by the beam; A first sill support supported by the first hanging bolt; A first soffit supported by the first soffit support; a first ceiling board supported by the first rough frame; A connecting hardware supported by the first hanging bolt below the first soffit support and above the first ceiling board; a second hanging bolt supported by the connecting hardware below the first ceiling board; A second sill support supported by the second hanging bolt; A second soffit supported by the second soffit support; a second ceiling board supported by the second rough frame; The joint of the first ceiling board is located directly below the first hanging bolt, The connecting hardware has a first nut portion and a plate portion, the first nut portion is threaded onto the first suspension bolt, The plate portion is supported by the first nut portion so as to be rotatable about a vertical axis, and is a double ceiling suspension structure located in the joint of the first ceiling board.

2. 2. The double ceiling suspension structure according to claim 1, wherein the plate portion is supported by the first nut portion via a vibration-isolating material.

3. 2. The double ceiling suspension structure according to claim 1, wherein the plate portion is supported by the first nut portion via a bearing.

4. The first nut portion has a split nut portion and a bolt portion, The split nut part is a first nut piece and a second nut piece each having a female thread surface that can be screwed onto half the circumference of the first hanging bolt and the bolt portion; and a fixing means for fixing the first nut piece and the second nut piece, The first nut piece and the second nut piece are fixed by the fixing means in a state where they are threadedly attached to the entire circumference of the first hanging bolt and the bolt portion, 2. The double ceiling suspension structure according to claim 1, wherein the bolt portion rotatably supports the plate portion.

5. The connecting hardware further includes a second nut portion fixed below the plate portion, 2. The double ceiling suspension structure according to claim 1, wherein the second suspension bolt is threadedly engaged with the second nut portion.

6. 2. The double ceiling suspension structure according to claim 1, wherein the second suspension bolt is fixed to the lower part of the plate portion.

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