JP7179265B2 - Mounting structure of joists - Google Patents

Description

TECHNICAL FIELD The present invention relates to a ceiling joist mounting structure suitable for a ceiling foundation with a narrow ceiling space formed between a frame ceiling (ceiling slab, C-shaped steel, etc.) and a ceiling panel.

In general, a conventional ceiling consists of a plurality of suspension bolts that hang down from the ceiling slab that constitutes the ceiling frame, C-shaped steel (C-shaped lip channel material) for rafters and purlins, etc., at predetermined intervals. , a channel-shaped joist receiver (ceiling base material) supported via a joist receiver hanger or hanging hardware at the lower end between these hanging bolts, and an inverted U-shaped inside the upper ends of both side surfaces that open upward It is composed of a plurality of channel-shaped ceiling joists (ceiling base material) having grooves and attached to ceiling joist receivers via ceiling joist mounting brackets, and a ceiling panel screwed to the ceiling joists.

By the way, conventionally, the ceiling joist receiving hanger adopted for such a ceiling base has an inverted L-shaped hanging bolt fixing portion connected to the lower end of the hanging hanging bolt so that the vertical position can be adjusted by adjusting the nut. A U-shaped joist receiver support part is vertically installed to support the joist receiver by dropping it from above, and the vertical position can be changed by changing the position by tightening and loosening the nut of the joist receiver hanger with respect to the hanging bolt. is known (see FIG. 4 of Patent Document 1).

However, such a vertical joist receiver hanger needs to be supported by dropping the entire height and width of the joist receiver into the joist receiver support part, and the depth is longer than the height and width of the joist receiver. Therefore, the hanging bolt fixing part must inevitably be provided above the joist receiving support part, and the whole must be formed vertically long in a side view. There is a production constraint that it must not be. For this reason, when the ceiling space formed between the ceiling part of the frame and the ceiling panel is a narrow ceiling base structure, for example, there is no space for installing the ceiling joist hanger in the first place, or the hanging bolt There is a problem that it cannot be adopted because it becomes impossible to drop the ceiling joist receiver into the ceiling joist receiver support part in a state where the joist receiver hanger is fixed with the nut.

Therefore, as disclosed in Patent Document 2, the applicant of the present application has a U-shaped joist receiving fitting fixing portion (61) in a side view and a nut fixing the lower end portion side of the suspension bolt (2) on the opposite side thereof. The hanging bolt fixing part (62) bent in an L shape is integrally formed, the height width of the ceiling joist receiving fixing bracket (6) is shortened, and the upper nut (21) is attached to the ceiling joist The ceiling joist receiver (3) is fixed to the lower end part of the suspension bolt regardless of whether it is newly installed or existing, even in a ceiling foundation structure with a narrow ceiling space, by making it possible to arrange it in a state where it does not protrude from the upper surface of the receiver (3). In order to make it possible, we proposed a joist support fixture (6) that is compact and reinforced against earthquakes.

However, regardless of the size of the ceiling space, the entire load of the ceiling base such as the joist receiving fixing bracket (6) and the joist receiver, the joist mounting bracket and joist receiving, and the ceiling panel concentrates on the hanging bolt fixing piece (621). There is no change in the fact that it is a ceiling structure that is applied by force, and when it is shaken by an earthquake or the like, the stress load is most concentrated, and the inverted L-shaped hanging bolt fixing piece of the joist receiving hanger (31) shown in FIG. Compared to the hanging bolt fixing piece (621), although it is possible to reduce and regulate the expansion deformation extending in a V-shape, rattling occurs between the joist (5) and the joist receiver (51), and the joist is fixed. While there is a concern that the metal fittings (5a) may be misaligned, the hanging bolts on the ceiling foundation with a narrow ceiling space are extremely short compared to those with a normal height space, so the impact of shaking on earthquake resistance is limited. The ceiling structure with small ceiling joist receiving fixing brackets (6) and ceiling joist receiving is of excessive quality, and the superiority of short suspension bolts in terms of earthquake resistance cannot be fully utilized. Realization of the attachment structure of the new joist which does not have been desired.

JP-A-2010-121370 JP 2017-218804 A

The present invention was devised to eliminate the above-mentioned problems. The hem can be attached directly to the hanging bolts via the joist mounting brackets to reduce the weight of the ceiling foundation. In this way, the ceiling load is dispersed, and the joist folded pieces are firmly press-fitted and fixed, and the joist side surfaces can be screwed to the side fitting pieces, so that the joist and the joist mounting bracket are a trinity. The fixed structure increases the rigidity and strength of the assembly, and in addition to the holding function for the joist folded piece, there is no ceiling space for mounting the joist receiving hanger, or even if the ceiling base structure is narrow To easily and suitably adopt the structure by reducing the vibration load of the entire ceiling base applied to the ceiling joist mounting bracket suspended and fixed to the lower end of the hanging bolt, taking advantage of the superiority of the short hanging bolt in terms of earthquake resistance. It is an object of the present invention to provide a mounting structure for a ceiling joist.

In order to solve the above problems, the mounting structure of the ceiling joist of the present invention includes a plurality of hanging bolts that hang down from the ceiling of the building frame with a predetermined interval, and a joist mounting bracket on the lower side of the hanging bolt. In the ceiling foundation including a plurality of ceiling joists attached to the joists and the ceiling panel screw-fixed to the joists, the upper ends of both joist side surfaces, which are the opening sides of the joists, are inwardly inverted L-shaped Or, it is formed with a joist bent piece bent in a U shape, and the joist mounting bracket includes an upper surface fitting piece that covers the opening side of the joist, and both sides of the upper surface fitting piece. a ceiling joist fitting member formed in a downward U-shape having a side surface fitting piece bent downward so as to come into contact with the ceiling joist side surface; A joist support receiving member that straddles both the joist bent pieces and supports and receives the lower surface side thereof is provided as a set, and the joist covering member and the joist support receiving member are bored respectively A hanging bolt is inserted into the bolt insertion hole, and the connecting assembly is possible in a state where the tip of the hanging bolt is supported to prevent it from coming off. In a vertical posture facing the longitudinal direction of the joist, it is arranged inside the joist, and in a horizontal posture by rotating operation, the joist folded piece is supported and received, and the joist fitting member is fitted to the joist. By tightening the nut provided on the hanging bolt on the upper side of the ceiling joist fitted member, the ceiling joist bent piece is brought into upward dynamic pressure contact with the upper surface fitted piece, and the ceiling joist support receiving member It is characterized in that the joist is attached to the lower end of the hanging bolt by clamping and fixing it between the upper ends of the hoisting bolt.

The present invention eliminates the ceiling structure in which the load of the entire ceiling base is concentratedly applied to the inverted L-shaped hanging bolt fixing piece of the ceiling joist receiving hanger, and the ceiling joist is removed from the ceiling. It can be directly attached to the hanging bolt via the edge mounting bracket, and not only does it reduce the weight of the ceiling base, but also the two members, the ceiling joist fitting member and the joist support receiving member, are attached to the lower end of the hanging bolt. Since there is a length width area between the upper surface side and the lower surface side, it is possible to directly retain and support at the center position through the bolt insertion hole, so the suspension load applied to the tip of the suspension bolt is evenly distributed. In addition, by tightening the nut provided on the hanging bolt on the upper side of the hoisting covered member, the joist bent piece is firmly pressed and clamped, and the hoist side surface is attached to the side covered piece. In addition to being able to be fixed with screws, it is possible to increase the assembly rigidity strength against torsion and bending deformation in a state where the outer circumference of the joist itself is reinforced by the fixing structure that is a trinity of the joist and the joist mounting bracket. . As a result, the vibration load applied to the tip of the hanging bolt when subjected to vertical or torsional shaking due to an earthquake, etc., is distributed in a well-balanced manner centering on the joist mounting bracket without being biased in one direction, resulting in a resonance effect. In addition, even if a load due to the ceiling's own weight is applied to the ceiling joist support receiving member, the three sides of both joist edge bent pieces and both joist edge side surfaces are firmly secured without causing bending deformation. The integrated state is maintained by reinforcing it, and it is possible to prevent rattling and positional deviation with the joist. In particular, it can be installed in a state where the seismic resistance assembly strength is improved, it can be easily adopted in a ceiling base structure with no or narrow ceiling space for installing a ceiling joist support hanger, and it is a short suspension for earthquake resistance. Taking advantage of the superiority of bolts, the load applied to the ceiling joist mounting bracket, which is suspended and fixed to the lower end of the suspension bolt, is only the joist and the ceiling panel. As a result, the seismic strength and seismic performance can be dramatically improved, the hanging posture of the suspension bolt can be preferably maintained for a long period of time, and a good suspension state can be permanently maintained.

It is an explanatory view showing a state in which the ceiling joist is attached to the hanging bolt suspended and fixed to the hanging bolt mounting bracket by the ceiling joist mounting bracket used in the mounting structure of the ceiling joist according to the embodiment of the present invention, (A) is a front view, and (B) is a plan view. It is an explanatory view showing a state in which the ceiling joist is attached to the suspension bolt suspended and fixed to the ceiling slab by another ceiling joist mounting bracket used in the ceiling joist mounting structure according to the embodiment of the present invention, (A) is its front view, and (B) is its side view. A joist mounting bracket showing a state in which a joist fitting member and a joist support receiving member are assembled to a suspension bolt suspended and fixed to the hanging bolt mounting bracket of the present invention, (A) is a front view thereof, ( B) is a side view. Fig. 10 is a ceiling joist mounting bracket showing another embodiment of the ceiling joist fitted member according to the present invention, wherein (A) is a front view thereof and (B) is a side view thereof; In the joist mounting structure according to the embodiment of the present invention, (A) is a perspective view of the suspension bolt mounting bracket attached to the C-shaped steel, (B) is a perspective view showing the joist fitting member of the joist mounting bracket, (C) is a perspective view showing another embodiment of the ceiling joist fitting member, and (D) is a top side and bottom side perspective view showing the ceiling joist support receiving member of the ceiling joist fitting. The ceiling joist mounting bracket used in the embodiment of the present invention, (A) is an explanatory view showing the state assembled with the hanging bolt to the hanging bolt mounting bracket, (B) is suspended and fixed to the ceiling slab to the hanging bolt It is explanatory drawing which shows the state which carried out the retainer assembly|attachment using the nut. It is an explanatory view showing a procedure of attaching a ceiling joist in a state in which a ceiling joist mounting bracket used in the embodiment of the present invention is attached to a suspension bolt or a fastening bolt.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the ceiling joist mounting bracket will be described below in detail with reference to the drawings.
FIG. 1 is an explanatory diagram showing a state in which a ceiling joist is attached to a hanging bolt suspended and fixed to a hanging bolt mounting bracket by a ceiling joist mounting bracket used in an embodiment of the present invention. The shown C-shaped steel 1 (C-shaped lip channel material) is constructed for rafters and purlins and constitutes the ceiling of the building frame. The ceiling foundation suspended and fixed via hanging bolt mounting brackets 3 is shown.
FIG. 2 is an explanatory diagram showing a state in which the ceiling joist is attached to the suspension bolt suspended and fixed to the ceiling slab. The suspension bolt 2 without the bolt head 2a is used for the ceiling slab 1a shown in this figure. It shows the ceiling base.
In such a ceiling base, a plurality of hanging bolts 2 hanging down from the ceiling of the skeleton with a predetermined interval, and a ceiling joist 4 (ceiling base material) and a ceiling panel screw-fixed to the joists 4.

The mounting structure of the ceiling joist 4 shown in this embodiment is suitable for a ceiling foundation structure with a narrow ceiling space formed between the frame ceiling (C-shaped steel 1, ceiling slab 1a, etc.) and the ceiling panel. An example of construction adopted when the edge 4 is attached is shown, but depending on the size of the ceiling space, the anti-vibration fixed to the hanging bolt 2 between the ceiling part of the building frame and the joist mounting bracket 5 A horizontal anti-vibration (ceiling base material) is installed via metal fittings.

As the joist 4, a thick plate material with a thickness standard of about 1.2 mm or 1.6 mm is used, and the upper ends of both joist side surfaces 42, 42 are bent inward with the opening side facing upward. Inverted L-shaped joist bent pieces 41, 41, or inverted U-groove-shaped joist in which the upper ends of both sides of the opening side are bent inward by a thin plate material of about 0.5 mm There are some that have a bent edge piece 41, and there are double joists and single joists with different width dimensions, and 19 types (19 mm) and 25 types (25 mm) with different heights and widths. In the embodiment, a double joist type 19 having this inverted U-shaped groove-shaped joist bent piece 41 is exemplified. Moreover, the joists 4 are arranged orthogonally to the C-shaped steel 1 in the ceiling structure shown in FIG.

Next, the ceiling joist mounting bracket used in the ceiling joist mounting structure according to the embodiment of the present invention will be described with reference to FIGS. Fig. 3 (A) is a front view of the joist mounting bracket, (B) is a side view, and Fig. 4 shows another embodiment of the joist mounting bracket (A) is a front view, (B) is a side view is. (A) of FIG. 5 is a perspective view of the suspension bolt mounting bracket attached to the C-shaped steel, (B) is a perspective view showing the joist covering member of the joist mounting bracket, (C) is the joist covering member and others (D) is a perspective view of the upper surface side and the bottom surface side showing the joist support receiving member of the joist mounting bracket.

As shown in these figures, the suspension bolt mounting bracket 3 includes a front fixing piece 31 that is screwed in contact with the lip piece 11 on the opening side of the C-shaped steel 1, and both sides of the front fixing piece 31 are L-shaped. Side locking pieces 32, 32 which are bent into a letter shape and have grooves 33, 33 for engaging the lip piece 11 at the corners thereof, and side locking pieces on the upper and lower sides of the front fixing piece 31. A pair of upper hanging piece 341 and lower hanging piece 342 for fixing the hanging bolt 2 hanging down through hanging bolt insertion holes 34a and 34b respectively drilled in the central part thereof. The whole is integrally formed by pressing a thick plate material having a plate thickness of 2.3 mm. After being inserted into the hanging bolt insertion hole 34b, the nut 2b is arranged between the upper hanging piece 341 and the lower hanging piece 342, and the nut 2b is screwed after being inserted into the hanging bolt insertion hole 34a. The joist mounting bracket 5 is set in a state in which it is attached to the upper hanging piece 341 to prevent it from coming off. In addition, screw holes 31a, 31a are formed at predetermined positions of the front fixing piece 31. As shown in FIG.

The joist mounting bracket 5 is composed of a set of two members, a joist fitting member 51 and a joist support receiving member 52 (52'), and is assembled to the suspension bolt 2 or the fastening bolt 21. The joist fitting member 51 includes a top fitting piece 511 that covers the opening side of the joist 4 and is folded downward from both sides of the top fitting piece 511 so as to be in contact with the outer peripheral side of both joist side surfaces 42 , 42 . It has bent side fitting pieces 512, 512 and is formed into a downward U-shape, and the whole is integrally molded by pressing a thick plate material having a thickness of 2 mm. A bolt insertion hole 51a for inserting the suspension bolt 2 or the fastening bolt 21 is formed in the central portion of the top fitting piece 511, and a screw hole 51b is provided at a location facing a detent contact piece 523, which will be described later. are drilled respectively.

The joist support receiving member 52 has hanging bent pieces 522, 522 bent downward into a U-shape through the upper surface piece 521, and side fitting pieces 512, 512 at both ends thereof. It has anti-rotation contact pieces 523, 523 capable of restricting anti-rotation by coming into face-to-face contact with the inner surfaces of the edge side surfaces 42, 42, and has a bolt insertion hole for the suspension bolt 2 or the fastening bolt 21 in the upper surface piece 521, which is the central portion. Both hanging bent pieces 522, 522 are provided with a grooved bolt holding portion 52b capable of preventing rotation of the bolt head 2a or nut 2b of the suspension bolt 2. It is integrally formed by pressing with a plate material thinner than the 1.6 mm joist fitting member 51 . The ceiling joist fitting member 51 and the ceiling joist support receiving member 52 rotate and rotate to the lower surface area of the upper surface fitting piece 511 (U-shaped inner surface area of the ceiling ceiling fitting member 51) via the hanging bolt 2 or the fastening bolt 21. It is shipped from the factory in a temporarily assembled state in which it is connected so as to be capable of vertical movement.

The bolt holding portion 52b is formed in a U-shaped notched groove, and the width of the groove is wider than the dimensional width of one side of the bolt head 2a or the nut 2b of the hanging bolt 2, and the width of the groove is sufficient to prevent rotation. , and the hanging bolt 2 can be arranged and set from the opening side of the notch groove. Both ends of the upper surface piece 521 are notched in a substantially V shape so as to be inserted into the inverted U-shaped grooves of the joist bent pieces 41, 41 to support and receive the joist 4, and each hanging fold is made. The joist support receiving grooves 52c formed at four locations of the curved pieces 522 and the both ends of the hanging bent pieces 522, 522 are rotated from the vertical posture to the horizontal posture. When the posture is changed, the anti-rotation contact pieces 523, 523 face the side fitting pieces 512 and come into face-to-face contact with the inner surfaces of the both edge side surfaces 42, 42. As shown in FIG. The bolt holding portion 52b and the joist support receiving groove 52c may be formed by turning the joist support receiving member 52 upside down.

In other words, the anti-rotation contact pieces 523, 523 are provided at opposite ends of the hanging bent pieces 522, 522 so that the posture can be changed from the vertical posture to the horizontal posture by rotating clockwise in one direction. are bent in the same direction, and the upper end surface thereof is extended and bent so as to be flush with the upper end surfaces of the joist support receiving grooves 52c . . . Both joist side surfaces 42, 42 are fixed with drill screws between the function of supporting and receiving the joist 4 by being inserted into the letter-shaped groove together with the joist support receiving grooves 52c ... and the side fitting pieces 512, 512. By doing so, it also has a function of press-contacting and clamping. Even when the nut 2b is set on the bolt holding portion 52b, if the suspension bolt 2 or the fastening bolt 21 is rotated, the joist support receiving member 52 can be rotated from the vertical posture to the horizontal posture, but the rotation is smooth. If not, a finger press operation is sufficient. In addition, the detent contact piece 523 may be formed as necessary, and its bending form is arbitrary. Good luck.

FIGS. 2 and 5(A) show another embodiment of the joist fitting 5, and the joist fitting member 51′ shown in these figures is mounted upward from the upper surface fitting piece 511 of the joist fitting member 51. An inverted L-shaped suspension bolt fixing portion 513 is provided, and a suspension bolt insertion hole 51c is bored in the center of the upper surface of the suspension bolt fixing portion 513. The rest of the configuration is as follows. Since they are the same, detailed description is omitted. When using this ceiling joist fitting member 51', the ceiling joist fitting member 51' and the ceiling joist support receiving member 52 are connected to each other through the fastening bolt 21 (bolt 21a and nut 2b), and the lower surface area of the upper surface fitting piece 511. In the case of temporary assembly that is connected so as to be rotatable and vertically movable, mainly when attaching to the suspension bolt 2 suspended and fixed to the ceiling slab 1a, the adjustment range of the vertical position of the ceiling joist mounting bracket 5 becomes large. In this case, it may be used in combination with the joist fitting member 51, or may be used alone. Further, instead of using the fastening bolt 21, a nut 2b may be used at the tip of the hanging bolt 2 to prevent it from slipping out while being set by the bolt holding portion 52b so as to prevent rotation.

Next, the procedure for attaching the joist 4 according to the embodiment of the present invention will be described with reference to FIGS. 6A, 6B and 7A to 7D. As shown in these figures, first, when the building frame ceiling at the construction site is C-shaped steel 1 shown in FIG. 5 to assemble the hanging bolt mounting bracket 3. In this assembly, the tip of the suspension bolt 2 is inserted into the suspension bolt insertion hole 34a, the nut 2b is screwed in, and the suspension bolt is suspended and fixed by further inserting it into the suspension bolt insertion hole 34b and screwing the nut 2b. It is temporarily attached to the portion 34 in a state of preventing it from coming off. In this assembled state, the hooking grooves 313 of the side locking pieces 32, 32 are inserted into the lip piece 11 from the opening side of the C-shaped steel 1 to set the suspension bolt mounting bracket 3, and the joist mounting bracket 5 After completing the work of assembling and fixing the joists 4, the front fixing piece 311 is screwed to the lip piece 11 through the screw hole 31a, and the mounting work is completed. At that time, the vertical position adjustment of the joist mounting bracket 5 is performed by tightening and loosening the nut 2b screwed into the upper surface of the upper hanging piece 341, and the nut 2b between the upper hanging piece 341 and the lower hanging piece 342 is adjusted. Fix the position by tightening.

In this way, the hanging bolt 2 is inserted into the lower hanging piece 342 side and fixed with the nut on the upper hanging piece 341 side. Therefore, when subjected to vibration due to an earthquake or the like, the vibration load is not concentrated at one point, and the vibration from the ceiling panel side is absorbed within the slightly larger insertion hole diameter on the suspension bolt insertion hole 34b side. By allowing a slight vibration, the vibration transmission to the upper hanging piece 341 fixed with the nut can be attenuated, and the suspension bolt 2 can be supported and received in a distributed manner, thereby preventing bending deformation of the suspension bolt 2 .

On the other hand, as shown in FIG. 6(B), when the ceiling part of the frame is a ceiling slab 1a or the like to which the suspension bolt 2 is suspended and fixed in advance, the upper nut 2b and the joist cover are attached to the suspension bolt 2. The fitting member 51, the joist support receiving member 52, and the lower nut 2b are assembled and set in this order. In this state, by tightening and loosening the lower nut 2b, the upper and lower positions of the ceiling joist fittings 5 are adjusted in a process prior to mounting the ceiling joist 4.例文帳に追加That is, the hanging bolts 2 suspended and fixed to the ceiling slab 1a have a small error at the tip, and even if the joist 4 in this embodiment is a shallow bottom 19 type with a height and width of 19 mm Since there is an adjustment width of about 5 mm between the joist support receiving member 52 and the bottom of the joist 4, height alignment is possible, and if it is 25 type (25 mm), there is a sufficient adjustment width is obtained. Further, when the joist fitting member 51' is used together with the fastening bolt 21 in place of the joist fitting member 51, the height position is adjusted by fixing the nut in the same manner as the conventional joist receiving hanger. Unlike the structure in which the ceiling load is supported and received on the side opposite to the hanging bolt 2 fixed with the nut, the upper surface fitting piece 511 and the hanging bolt fixing part 513 are distributed and arranged in the longitudinal direction of the ceiling joist 4. Therefore, the ceiling load is also supported in the same direction (coaxially), and combined with the weight reduction of the entire ceiling, it is possible to dramatically improve the earthquake resistance performance.

Next, after temporarily assembling the ceiling joist mounting bracket 5 to the hanging bolt 2 in this way, for the procedure for attaching the ceiling joist 4 to the ceiling joist mounting bracket 5, see (A) to (D) in FIG. to explain. First, in this set state, the joist 4 is brought into contact with the bottom surface by swallowing the joist support receiving member 52 from the opening side (see FIG. (A)), and the suspension bolt 2 or the fastening bolt 21 is rotated, Alternatively, including the case where the joist support receiving member 52 is supported and received by the nut 2b shown in FIG. After the abutting piece 523 is set in a horizontal posture with the contact piece 523 in face-to-face contact, the joist 4 is lowered by its own weight, so that the inverted U-shaped groove of the joist bent piece 41 becomes the joist support receiving groove 52c. It is set in a suspended state in which it is inserted along an inclination of (see Fig. (B)).

From this set state, by tightening the nut 2b of the hanging bolt 2 (fastening bolt 21), the joist support receiving member 52 and the joist 4 are moved upward, and the joist bent piece 41 is replaced by the upper surface fitting piece. 511 and both ends of the joist support receiving member 52 (the upper end surface of the joist support receiving groove 52c and the anti-rotation contact piece 523) are firmly pressed against each other and sandwiched between them (see FIG. (C)). At the time of this operation, the joist support receiving member 52 has a predetermined gap between the anti-rotation contact piece 523 and both joist side surfaces 42, 42 in order to allow the rotation from the vertical posture to the horizontal posture. In addition, the rotational operation range is set with an allowable range of about 90 degrees plus 1 or 2 degrees shown in FIG. is in contact with the inner surface of the joist side surface 42 in an inclined state, and while the contact state is maintained, the upper surface fitting piece 511 of the joist fitting member 51 and the upper surface piece 521 of the joist support receiving member 52 The joist folded piece 41 can be firmly pressed and clamped in a state in which a gap is held between the joist and the so-called snap is applied, and the joist support receiving member 52 is buckled due to excessive tightening or vibration. Both side edge side surfaces 42, 42 are securely clamped and fixed by screws between the side fitting piece 512 and the anti-rotation contact piece 523 while maintaining this clamping state, The assembling rigidity strength can be strengthened in a state in which three outer peripheral surfaces of the joist 4 itself are reinforced.

Moreover, the two members, the joist fitting member 51 and the joist support receiving member 52, are placed with respect to the lower end of the suspension bolt 2, and the length width region between the upper surface and the lower surface (between the bolt head 2a and the upper nut 2b) , and can be directly supported at the center position via the bolt insertion holes 51a and 52a, so that the lifting load applied to the tip of the hanging bolt 2 (bolt head 2a) is supported by the joist support receiving member 52 The hanging bent pieces 522, 522 prevent deformation of the hanging bolt 2, and can be firmly supported and assembled. It is possible to disperse the joist joist 4 and prevent rattling and positional deviation, so that the sandwiched state can be preferably maintained, and the joist covered member 51 and the joist support receiving member 52 are deformed. Therefore, it is possible to improve the earthquake resistance assembly strength, and by taking advantage of the superiority of short suspension bolts in terms of earthquake resistance, the load applied to the joist mounting bracket 5 suspended and fixed to the lower end of the suspension bolt 2 is reduced. Only the joists 4 and the ceiling panel are provided, and the vibration load can be reduced as the weight of the whole ceiling base is reduced.

After that, both side edge sides 42, 42 are clamped and fixed between the side fitting piece 512 and the anti-rotation contact piece 523 with screws, and the mounting work is completed. In this clamping fixation, the lower hem support receiving member 52 is made of a thicker plate material than the joist fitting member 51, and is molded in a downward U-shape as a whole. It is stronger than the plate material formed in , and even if the suspension bolt 2 (fastening bolt 21) is firmly tightened with the nut 2b, it is fixed via both hanging bent pieces 522, 522 Therefore, deformation such as buckling is prevented from occurring between them, and the screw hole 51b drilled in the side fitting piece 512 is set to have substantially the same diameter as the outer diameter of the drill screw. Even if the abutting piece 523 is screwed in a state in which it does not come into contact with the both edge side surfaces 42, 42, the drill screw is slanted through the screw hole 51b and the detent abutting piece 523 is drawn, It can be clamped and fixed in a state of contact with the inner surfaces of both side edge sides 42, 42. - 特許庁

That is, by clamping and fixing both the joist side surfaces 42, 42 between the side fitting piece 512 and the detent abutting piece 523, the conventional side fitting piece 512 and the joist side surface 42 are fixed. Compared to direct screw fixing, when a vibration load is applied intensively to the screw fixing part, deformation or cracking occurs due to collision with the screw in the horizontal direction, etc., or the screw fixing function is impaired. In addition, there is a risk that the joist 4 itself may be bent or split at the screwed portion. The attachment strength can be improved, and the tightening and clamping state on the four surfaces of the joists 4 can be maintained for a long period of time.

In the embodiment of the present invention configured as described above, now, in the construction of the ceiling foundation, the joist mounting bracket 5 is attached to the lower side of the hanging bolt 2 that hangs down from the ceiling of the building frame with a predetermined interval. The mounting structure of the ceiling joist 4 according to the present invention consists of the upper surface fitting piece 511 covering the opening side of the ceiling joist 4 and the upper surface fitting piece A joist fitting member 51 formed in a downward U-shape having side fitting pieces 512 bent downward so as to be in contact with both joist side surfaces 42, 42 from both sides of 511; A joist support receiving member 52 disposed in the lower surface area of the fitted member 51 and straddling both the joist edge bent pieces 41, 41 and supporting and receiving the lower surface side thereof is provided as a set, and the joist fitted member 51 and the hoisting support receiving member 52 are inserted into the bolt insertion holes 51a and 52a that are bored in communication with each other, and the tip of the suspension bolt 2 is inserted into the tip of the suspension bolt 2 to prevent it from coming off. The joist support receiving member 52 is arranged in the interior of the joist 4 in a vertical posture facing the longitudinal direction of the joist 4 in a state where it is configured to be connectable and assembled and assembled with the suspension bolt 2, and The joist bent pieces 41, 41 are supported and received in a lateral posture by rotating operation, and the joist fitting member 51 is fitted and set to the joist 4, and is provided on the hanging bolt 2 on the upper side of the joist fitting member 51. By tightening the nut 2b, the joist bent pieces 41, 41 are brought into upward dynamic pressure contact with the upper surface fitting piece 511, and are clamped and fixed between the upper end portions of the joist support receiving member 52. A joist 4 is attached to the lower end of the hanging bolt 2. - 特許庁

With this configuration, the ceiling structure in which the load of the entire ceiling foundation is concentrated on the inverted L-shaped suspension bolt fixing piece of the ceiling joist receiving hanger is eliminated, and the ceiling joist 4 is attached via the ceiling joist mounting bracket 5. can be directly attached to the suspension bolt 2, not only to reduce the weight of the ceiling base, but also to reduce the weight of the ceiling base. Since there is a length width region between the side and the bottom side, it is possible to directly retain and support at the center position via the bolt insertion holes 51a and 52a, so the suspension load applied to the tip of the suspension bolt 2 is evenly distributed. In addition to being able to be assembled in a state where the ceiling joist is folded, by tightening the nut 2b provided on the hanging bolt 2 on the upper side of the ceiling joist fitted member 51, the ceiling joist bent pieces 41, 41 are firmly press-contacted and fixed, and The joist side surface 42 can be screwed to the side fitting piece 512, and the outer circumference of the joist 4 itself is reinforced by the fixing structure that is a trinity of the joist 4 and the joist mounting bracket 5. It is possible to increase the assembling rigidity strength against torsion and bending deformation, and it is possible to easily perform the screw fixing work for pinching the both side edges 42 , 42 .

As a result, the vibration load applied to the tip of the hanging bolt when subjected to shaking in the vertical direction or torsional direction due to an earthquake or the like is distributed in a well-balanced manner centering on the ceiling joist mounting bracket 5 without being biased in one direction, resulting in resonance. Amplification of shaking due to the action is suppressed, and even if a load due to the ceiling's own weight is applied to the ceiling joist support receiving member 52, bending deformation does not occur, and both joist edge bent pieces 41, 41 and both joist edge side surfaces 42 are prevented. , 42 are firmly reinforced to maintain an integrated state, and rattling and displacement with respect to the joist 4 can be prevented. In particular, the advantage of the short hanging bolt 2 for earthquake resistance is that it can be installed in a state where the earthquake resistance assembly strength is improved, and even if there is no ceiling space for installing the ceiling joist hanger or the ceiling base structure is narrow. The load applied to the joist mounting bracket 5 suspended and fixed to the lower end of the suspension bolt 2 is only the joist 4 and the ceiling panel, and the vibration load is reduced with the weight reduction of the whole ceiling base. , the quake-resistant strength and quake-resistant performance can be dramatically improved, the hanging posture of the suspension bolt 2 can be preferably maintained for a long period of time, and a good suspension state can be permanently maintained.

In order to retain the joist fitting member 51 and the joist support receiving member 52 through the bolt insertion holes 51a and 52a without relying on the suspension bolts 2, the fastening bolts 21 are inserted into the bolt insertion holes 52a and 52b. is inserted into the joist fitting member 51 to prevent it from slipping off, and the hanging bolt fixing portion 513 is formed on the joist fitting member 51 and bent in an inverted L shape standing up against the upper surface fitting piece 511. Then, a nut is fixed to the tip of the hanging bolt 2 with its upper and lower surfaces interposed through the hanging bolt insertion hole 51c drilled in the hanging bolt fixing portion 513, and the fastening bolt 21 is tightened to bend the joist. The joists 4 are attached to the lower ends of the suspension bolts 2 by clamping and fixing the pieces 41, 41 to the upper surface fitting piece 511 and clamping and fixing them between the upper end portions of the joist support receiving member 52. It is configured to push.

With this configuration, when the joist covered member 51' is used together with the fastening bolt 21 instead of the joist covered member 51, the height position is adjusted by fixing the nut as in the conventional joist receiving hanger. In addition, it can be applied as an auxiliary member to be adopted only in necessary places together with the joist fitting member 51, and moreover, like a joist receiving hanger, the ceiling load can be applied to the hanging bolt 2 fixed with a nut. Unlike the structure that supports and receives the ceiling joist receiver on the opposite side, the upper surface fitting piece 511 and the suspension bolt fixing part 513 are distributed in the longitudinal direction of the ceiling joist 4, so the ceiling load is also in the same direction (on the same axis). The structure supports and receives the ceiling, and combined with the weight reduction of the entire ceiling, it is possible to dramatically improve the earthquake resistance performance.

In addition, the joist support receiving member 52 has a hanging bent piece 522 that is bent downward into a U-shape through the upper surface piece 521, and opposite side fitting pieces 512 at both ends thereof. , and the anti-rotation contact pieces 523, 523 face the both edge side surfaces 42, 42 in a lateral posture by rotating operation. Since it is configured to be able to be screwed between the side fitting pieces 512 and 512 by sandwiching the joist side surfaces 42 and 42, there is a gap between the top fitting piece 511 and the top piece 521. In a state where the snap is effective, the three outer peripheral surfaces including both joist edge bent pieces 41 and 41 are assembled in a state in which they are firmly pressed and sandwiched by the joist fitting member 51 and the joist support receiving member 52. It can be attached and fixed, and both are integrated with the assembly rigidity strength in which the outer peripheral surface of the joist 4 itself is reinforced. Positional deviation is prevented, and the clamping state can be preferably maintained. In particular, when using the joist 4 formed of a thin plate material, damage such as cracks occurs in the screwed portion compared to the case where the side fitting piece 512 and the joist side 42 are directly fixed with screws. The fear is avoided, and deformation of the ceiling joist fitting member 51 and the ceiling joist support receiving member 52 does not occur, and the seismic resistance assembly strength can be improved.

In addition, since the upper ends of the anti-rotation abutting pieces 523, 523 are also used as support receiving pieces for supporting and receiving the joist bent pieces 41, as the joist support receiving member 52 is moved upward, The joist 4 can be supported by entering the inverted U-shaped grooves of the joist bent pieces 41, 41 together with the joist support receiving groove 52c, and the joist 4 is supported and received with a wide area by tightening the nut 2b. Even if the joist 4 is vibrated in the longitudinal direction, it can be jointly supported and held with the same width as the vertical width of the joist fitted member 51, and the hanging bolt 2 ( The vibration load can be distributed and supported around the fastening bolt 21). As a result, it is possible to reinforce the vibration load in the longitudinal direction to increase the assembly rigidity strength for earthquake resistance, the earthquake resistance function in the longitudinal direction and the inclined direction of the ceiling joist 4 is enhanced, and the positional deviation of the ceiling joist 4 is restricted. It is possible to obtain an earthquake-resistant structure in which the tight contact state thus obtained is maintained, the twisting and tilting are received without impairing the clamping function to the joists 4, and rattling is prevented from occurring between them.

In addition, the hanging bent pieces 522, 522 are formed with a bolt holding portion 52b at the lower central portion thereof, in which the bolt head 2a or the nut 2b can be set so as to prevent the bolt head 2a or the nut 2b from rotating. Since the joist support receiving member 52 is held in a regulated state by the joist 52b, when the upper nut 2b is tightened, the joist support receiving member 52 is forcibly drawn to the joist receiving member 51 and moved upward for crimping. Then, the joist bent piece 41 can be firmly crimped and clamped between the two so as to be integrally fixed.

In addition, when the joist bent pieces 41, 41 are inverted U-shaped grooves, they are inserted into the inverted U-shaped grooves at both upper end portions of the joist support receiving member 52 to support the joist 4. Since the joist support receiving grooves 52c which are notched in a substantially V shape are formed so as to receive them, the joist support receiving members 52 can be lowered by the own weight of the joists 4 in a state of being set in a horizontal posture. Then, it can be inserted into the inverted U-shaped groove along the inclination of the joist support receiving groove 52c, and the anti-rotation contact piece 523 follows the insertion operation and comes into face-to-face contact with the inner surface of the joist side surface 42. It can be set in a suspended state.

In addition, in the ceiling base where the hanging bolt 2 is suspended and fixed via the hanging bolt mounting bracket 3 attached to the C-shaped steel 1 constituting the ceiling part of the building frame and the ceiling base, the hanging bolt mounting bracket 3 is attached to the C-shaped steel 1 The front fixing piece 31 is abutted against the lip piece 11 on the opening side of the front fixing piece 31 and fixed with screws. The side locking pieces 32, 32 in which the hooking grooves 33, 33 are notched, and the front fixed piece 31 are bent against the side locking piece 32 above and below, and are bored in the center thereof. The hanging bolt hanging fixing portion 34 for fixing the hanging bolt 2 hanging down is provided through the hanging bolt insertion holes 34a and 34b. The vertical position of the joist 4 attached to the lower end of the hanging bolt 2 can be adjusted on the side of the hanging bolt mounting bracket 3 by changing the vertical position of the hanging bolt by tightening and loosening the nut from the state where the part is fixed with the nut. It has become.

With this configuration, the suspension bolt 2 with the bolt head 2a can be used, and the joist fitting member 51 and the joist support receiving member 52 are preliminarily assembled to the suspension bolt 2 before being shipped from the factory. In particular, when applied to a ceiling base structure with a narrow ceiling space, not only can it be easily handled, but also during the fixing work of assembling the joist 4 to the joist mounting bracket 5 And after the completion of fixing, the vertical position of the joist mounting bracket 5 can be adjusted by tightening and loosening the nut 2b on the upper hanging piece 341, and the position can be adjusted by sliding the lip piece 11. . Moreover, the suspension bolt 2 is inserted into the lower hanging piece 342 and fixed with a nut on the upper hanging piece 341 side. Since it is supported at two points, when it receives vibration due to an earthquake, etc., the vibration load does not concentrate at one point, and the vibration from the ceiling panel side is absorbed within the slightly larger insertion hole diameter on the suspension bolt insertion hole 34b side. By allowing a slight vibration, the transmission of vibration to the upper hanging piece 341 fixed with the nut can be damped, and distributed support can be received.

1 C-shaped steel 11 Lip piece 1a Ceiling slab 2 Hanging bolt 2a Bolt head 2b Nut 21 Fastening bolt 21a Bolt 3 Hanging bolt mounting bracket 31 Front fixing piece 31a Screw hole 311 Front fixing piece 313 Locking groove 32 Side locking piece 33 Locking Groove 34 Hanging bolt suspension fixing part 341 Upper hanging piece 342 Lower hanging piece 34a Hanging bolt insertion hole 34b Hanging bolt insertion hole 4 Ceiling 41 Ceiling bent piece 42 Ceiling side surface 5 Ceiling mounting bracket 51 Ceiling covering member 511 Top fitting piece 512 Side fitting piece 513 Suspension bolt fixing part 51a Bolt insertion hole 51b Screw hole 51c Suspension bolt insertion hole 52 Ceiling support receiving member 521 Upper surface piece 522 Hanging bent piece 523 Contact piece 52a Bolt insertion hole 52b Bolt holding portion 52c Ceiling support receiving groove

Claims (7)

A plurality of suspension bolts suspended from the ceiling of the building frame with a predetermined interval, a plurality of joists attached to the lower side of the suspension bolts via joist mounting brackets, and screws fixed to the joists. In the ceiling base including the ceiling panel,
The joist is formed with a joist folded piece that is bent inward in an inverted L-shape or U-shape at the upper ends of both joist side surfaces that are the opening side,
The joist mounting bracket has a top fitting piece that covers the opening side of the joist, and a side fitting piece that is bent downward from both sides of the top fitting piece so as to be in contact with both joist side surfaces. and a ceiling joist covering member formed in a downward U-shape, and a ceiling joist covering member disposed in the lower surface area of the ceiling covering member and supporting and receiving the lower surface side thereof straddling both the joist bent pieces. Equipped with a support receiving member as a set,
The ceiling joist fitting member and the ceiling joist support receiving member are configured to be connectable and assembled in a state in which hanging bolts are inserted through bolt insertion holes drilled in each of the hanging bolts and supported by the ends of the hanging bolts to prevent them from coming off. Seriously,
In a state where it is assembled to the suspension bolt, the joist support receiving member is placed inside the joist in a vertical posture facing the longitudinal direction of the joist, and the joist bending piece is placed in a horizontal posture by rotating operation. is supported and received, and the joist fitting member is fitted and set on the joist,
By tightening the nut provided on the hanging bolt on the upper side of the ceiling joist fitting member, the ceiling joist bent piece is brought into upward dynamic pressure contact with the upper surface fitting piece, and the upper both ends of the ceiling joist support receiving member A joist attachment structure characterized in that the joist is attached to the lower end of the suspension bolt by clamping and fixing it between the part. In claim 1, the joist fitting member and the joist support receiving member are retained and supported through the bolt insertion hole without relying on the suspension bolt, by inserting a fastening bolt through the bolt insertion hole. On the other hand, the joist fitting member is formed with a suspension bolt fixing portion that is bent in an inverted L shape and rises up against the upper surface fitting piece, and the suspension bolt is assembled. Through the suspension bolt insertion hole drilled in the fixed part, a nut is fixed to the tip of the suspension bolt with its upper and lower surfaces sandwiched, and the joist bent piece is fitted on the upper surface by tightening the fastening bolt. A joist attachment structure characterized in that the joist is attached to the lower end of the hanging bolt by being clamped and fixed between the upper end portions of the joist support receiving member by upward dynamic pressure contact with the piece. . In claim 1 or 2, the joist support receiving member includes a hanging bent piece that is bent downward through the upper surface piece in a U shape, and at both ends thereof, facing the side fitting piece, A detent contact piece capable of restricting rotation by face-to-face contact with the edge side face is provided, and the detent contact piece is brought into face-to-face contact with both edge side faces in a lateral posture by rotating operation, A mounting structure for a ceiling joist, characterized in that the ceiling joist side surface is sandwiched between the side fitting piece and can be fixed with a screw. 4. A ceiling joist attachment structure according to claim 3, wherein the upper end portion of said anti-rotation contact piece is also used as a support receiving piece for supporting and receiving said joist bent piece. 5. A ceiling joist attachment structure according to claim 3 , wherein said hanging bent piece has a bolt holding portion formed at the lower central portion thereof so that a bolt or nut can be set to prevent rotation. 6. In any one of claims 1 to 5, when the joist bent piece is an inverted U-shaped groove, it is inserted into the inverted U-shaped groove at both upper end portions of the joist support receiving member . A ceiling joist mounting structure characterized in that a ceiling joist support receiving groove is formed so as to support and receive the ceiling joist. 7. The ceiling base according to any one of claims 1 to 6, wherein the hanging bolts are suspended and fixed via hanging bolt mounting brackets attached to the C-shaped steel that constitutes the ceiling of the building frame,
The hanging bolt mounting bracket is attached to the lip piece on the opening side of the C-shaped steel and fixed with a screw. a side locking piece formed with a notched groove for engaging the lip piece; a suspension bolt hanging fixing part for hanging and fixing the hanging bolt through the insertion hole,
Attached to the lower end of the hanging bolt by changing the vertical position of the hanging bolt by tightening and loosening the nut from the state where the upper end of the hanging bolt is fixed to the hanging bolt hanging fixed part with the upper and lower surfaces sandwiched by the nut. A joist mounting structure, characterized in that the upper and lower positions of the joist are adjustable on the hanging bolt mounting bracket side.

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