JP2016205436A - Hanging metal fitting and construction method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve working efficiency when a hanging bolt and a brace are applied to a ceiling slab.SOLUTION: A hanging metal fitting 1 comprises a hanging bolt 2 with a male thread formed at an outer peripheral surface; a first brace connecting part 3a fixed at an upper part of the hanging bolt 2 under a state in which it is engaged in thread with the male thread and having a pair of swingable connecting arms 33 and 34; a second brace connecting part 3b attached at a lower part of the hanging bolt 2 under a state in which it is engaged in thread with the male thread and having a pair of swingable connecting arms 33 and 34; and a pair of braces 4a and 4b with upper ends fixed in advance in respect to each of the pair of connecting arms 33 and 34 provided at the first brace connecting part 3a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hanging metal fitting for supporting a ceiling structure in a suspended state and a method for constructing the same.

  The suspension bolts provided so as to hang down from the ceiling slab suspend and support various ceiling structures such as air conditioners, lighting fixtures, and various pipes. 2. Description of the Related Art Conventionally, there is known a brace coupling fitting that suppresses vibration of a suspension bolt when an earthquake occurs by attaching a brace that is an oblique reinforcing material to this type of suspension bolt (Patent Document 1). For example, Patent Literature 1 discloses a brace coupling fitting that can be attached to a suspension bolt attached in a suspended state from a ceiling slab and can support a pair of braces.

JP 2014-125812 A

  However, when trying to install the conventional brace connection brackets at the construction site of a new building, first attach a plurality of suspension bolts to the ceiling slab and then attach the brace connection brackets to the top and bottom of the plurality of suspension bolts. It is necessary to fix in a state where a pair of braces are cross-arranged between the four suspension bolts. For example, when supporting four places around the air conditioner with four suspension bolts, after attaching the four suspension bolts to the ceiling slab, a total of eight brace connecting brackets are attached to the four suspension bolts. It is necessary to attach them one by one, and work efficiency is poor.

  In particular, the construction of the suspension bolt is a work at a high place in a state where an operator rides on a self-propelled lift vehicle, and the work space is extremely narrow. Therefore, the work efficiency decreases as the number of steps during construction increases. Therefore, in the construction using the conventional brace coupling metal fitting, it has required ten to several tens of minutes from the start of the installation of the suspension bolt to the completion of the installation of all the braces.

  Therefore, in order to solve the above-described conventional problems, the present invention provides a hanging metal fitting capable of remarkably improving the work efficiency when attaching a suspension bolt and a brace to a ceiling slab and a method for constructing the same. That is the purpose.

  In order to achieve the above object, the invention according to claim 1 is a suspension fitting (1), comprising a suspension bolt (2) having a male screw formed on the outer peripheral surface, and an upper end side of the suspension bolt (2). A first brace connecting portion (3a) having a pair of swingable connecting arms (33, 34) attached in a state of being screwed with the male screw, and the male brace on the lower end side of the suspension bolt (2) A second brace connecting portion (3b) having a pair of swingable connecting arms (33, 34) attached in a state of being screwed with the screw, and the first brace connecting portion (3a). A pair of braces (4a, 4b) whose upper ends are fixed in advance to each of the pair of connecting arms (33, 34).

  According to such a configuration, the suspension bolt (2) can be applied to the ceiling slab while the upper ends of the pair of braces (4a, 4b) are fixed to the upper portion of the suspension bolt (2). Work efficiency is improved.

  According to a second aspect of the present invention, in the hanging bracket (1) according to the first aspect, the connecting arms (33, 34) provided in the first and second brace connecting portions (3a, 3b), respectively, And a flat plate portion (33b, 34b) whose tip is bent in an L shape, and a hole (33c, 34c) through which the brace (4a, 4b) is inserted is formed in the flat plate portion (33b, 34b). The pair of braces (4a, 4b) has an upper end portion provided on each of the pair of connecting arms (33, 34) of the first brace connecting portion (3a). 34b) is inserted into the holes (33c, 34c), and is fixed to the connecting arm (33, 34) with a plurality of nuts (5, 5) across the flat plate portion (33b, 34b). It is the structure to do.

  The invention according to claim 3 is a method for constructing a suspension fitting that is constructed using a plurality of the suspension fittings (1) according to claim 1 or 2, and is a first of the plurality of suspension fittings (1a, 1b). The upper end of the suspension bolt (2) provided on one suspension fitting (1a) is screwed and inserted into a first screw hole (9a) provided on the ceiling slab (101), thereby the first suspension. A step of fixing the metal fitting (1a) to the ceiling slab (101), and an upper end portion of the suspension bolt (2) provided on the second suspension metal fitting (1b) of the plurality of suspension metal fittings (1a, 1b) Fixing the second suspension fitting (1b) to the ceiling slab (101) by screwing and inserting it into a second screw hole (9a) provided in the ceiling slab (101); The lower end of one brace (4b) of the pair of braces provided on the hanging bracket (1a) is coupled to the second brace coupling portion (3b) of the second hanging bracket (1b). Fixing process The lower end of one brace (4a) of the pair of braces provided on the second suspension fitting (1b) is connected to the second brace connection portion (3b) of the first suspension fitting (1a). And a step of connecting and fixing to the structure.

  The invention according to claim 4 is a suspension metal fitting (10) having a first metal fitting (1a) and a second metal fitting (1b), and the first metal fitting (1a) is male on the outer peripheral surface. A first suspension bolt (2a) formed with a screw and a pair of swingable connecting arms (33) attached to the male screw on the upper end side of the first suspension bolt (2a). , 34) and a pair of swingable connecting arms attached to the male screw on the lower end side of the first suspension bolt (2a) and swingable. 33, 34) and the upper end of each of the second brace connecting portion (3b) and the pair of connecting arms (33, 34) provided in the first brace connecting portion (3a) are fixed in advance. A pair of braces (4a, 4b), and the second metal fitting (1b) includes a second suspension bolt (2b) having a male screw formed on an outer peripheral surface, and the second suspension bolt. (2b) A third brace connecting portion (3c) having a pair of swingable connecting arms (33, 34) attached in a state of being screwed with the male screw on the upper end side, and the second suspension bolt (2b) A fourth brace connecting portion (3d) having a pair of swingable connecting arms (33, 34) attached to the male screw on the lower end side of the third brace connecting portion (33d), and the third brace connecting portion ( A pair of braces (4c, 4d) whose upper ends are fixed in advance to each of the pair of connecting arms (33, 34) provided in 3c), and provided in the first metal fitting (1a) Of the pair of braces (4a, 4b) formed, the pair of connecting arms provided at the lower end of one brace (4b) of the fourth brace connecting portion (3d) of the second metal fitting (1b) One brace (4c) of the pair of braces (4c, 4d) attached to one of (33, 34) and provided on the second metal fitting (1b) The lower end portion is attached to one of the pair of connecting arms (33, 34) provided in the second brace connecting portion (3b) of the first metal fitting (1a). is there.

  According to a fifth aspect of the present invention, in the hanging bracket (10) according to the fourth aspect, the connecting arm (33) provided in each of the first to fourth brace connecting portions (3a, 3b, 3c, 3d). , 34) have flat plate portions (33b, 34b) whose ends are bent in an L shape, and holes (4a, 4b, 4c, 4d) are inserted through the flat plate portions (33b, 34b) ( 33c, 34c), and the pair of braces (4a, 4b, 4c, 4d) provided on each of the first and second metal fittings (1a, 1b) The brace connecting portions (3a, 3c) of the three brace connecting portions (3a, 3c) are inserted into the holes (33c, 34c) of the flat plate portions (33b, 34b) provided in the pair of connecting arms (33, 34), respectively. 33b, 34b) is fixed to the connecting arm (33, 34) with a plurality of nuts (5, 5).

  The invention according to claim 6 is the hanging bracket (10) according to claim 5, wherein the one brace (4b) of the pair of braces (4a, 4b) provided on the first bracket (1a) is provided. ) Is attached to one flat plate portion (33b) of the pair of connection arms (33, 34) provided at the lower end portion of the fourth brace connection portion (3d) of the second metal fitting (1b). The nut (6) is inserted into the hole (33c) provided and spaced apart from the flat plate portion (33b) on the front end side, and the pair of the second metal fittings (1b) are provided. The one brace (4c) of the braces (4c, 4d) has a pair of connecting arms (33) whose lower end portions are provided on the second brace connecting portion (3b) of the first metal fitting (1a). , 34) is inserted into the hole (34c) provided in one of the flat plate portions (34b), and the nut (6) is mounted at a position spaced from the flat plate portion (34b) on the tip side. With features It is the structure to do.

  The invention according to claim 7 is the construction method of the suspension fitting (10) according to any one of claims 4 to 6, wherein the first suspension bolt (2a) provided on the first fitting (1a) is provided. ) Fixing the first suspension bolt (2a) to the ceiling slab (101) by screwing and inserting the upper end of the first suspension hole into a first screw hole (9a) provided in the ceiling slab (101); The upper end of the second suspension bolt (2b) provided in the second metal fitting (1b) is screwed into a second screw hole (9a) provided in the ceiling slab (101) to thereby insert the first. Two suspension bolts (2b) to the ceiling slab (101), and one brace (4b) of the pair of braces (4a, 4b) provided on the first metal fitting (1a). A step of fixing a lower end portion to one connecting arm (33) of the fourth brace connecting portion (3d) mounted in advance, and the pair of braces provided on the second metal fitting (1b) (4 c), 4d), and fixing a lower end portion of one brace (4c) to one connecting arm (34) of the second brace connecting portion (3b) mounted in advance. It is the structure characterized by these.

  According to the present invention, since the suspension bolt can be fixed to the ceiling slab while the upper ends of the pair of braces are fixed to the upper portion of the suspension bolt, the work efficiency is improved, and the construction is performed in a shorter time than before. Will be able to.

It is a figure which shows the hanging metal fitting in 1st Embodiment. It is a perspective view which expands and shows a brace connection part. It is a figure which expands and shows the part to which the brace connection part was attached in a suspension metal fitting. It is a figure which shows the construction example of the hanging metal fitting in 1st Embodiment. It is a figure which shows the state by which two suspension metal fittings were attached to the ceiling slab. It is a figure which shows the state which arranged the brace between two suspension metal fittings. It is a figure which shows the state which carried out the cross arrangement | positioning of braces between four suspension metal fittings. It is a figure which shows the state which suspended and supported the ceiling structure with four suspension metal fittings. It is a figure which shows the hanging metal fitting in 2nd Embodiment. It is a figure which shows the state which expand | deployed the hanging metal fitting in 2nd Embodiment. It is a figure which shows the construction example of the hanging metal fitting in 2nd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each drawing referred to below, the same code | symbol is attached | subjected to the mutually common member, and the overlapping description about them is abbreviate | omitted.

(First embodiment)
FIG. 1 is a view showing a hanging metal fitting 1 according to the first embodiment of the present invention. The suspension fitting 1 is a fitting that is attached to a ceiling slab and supports a ceiling structure such as an air conditioner in a suspended state. As shown in FIG. 1, a hanging metal fitting 1 includes a hanging bolt 2 in which a male screw is formed on the outer peripheral surface of a metal rod having a circular cross section, and a brace connecting portion that is attached to two upper and lower portions of the hanging bolt 2. 3 and a pair of braces 4 fixed in advance to the brace connecting portion 3 attached to the upper part of the suspension bolt 2. As with the suspension bolt 2, the brace 4 has a configuration in which a male screw is formed on the outer peripheral surface of a metal rod-like body having a circular cross section. In the following description, the brace connecting part 3 attached to the upper part of the suspension bolt 2 will be referred to as a first brace connecting part 3a, and the brace connecting part 3 attached to the lower part of the suspension bolt 2 will be referred to as the second if necessary. This is referred to as a brace connecting portion 3b. When it is necessary to distinguish the pair of braces 4, they are referred to as braces 4a and 4b, respectively.

  FIG. 2 is a diagram showing the brace connecting portion 3 (3a, 3b). The brace connecting portion 3 includes a substantially rectangular columnar mounting portion 31 to be mounted on the suspension bolt 2, an L-shaped angle member 32 fixed to the side surface of the mounting portion 31 by welding or the like, and both end portions of the angle member 32 It has a pair of connection arms 33 and 34 attached so that rocking is possible. The mounting portion 31 has a screw hole 31a that penetrates in the vertical direction at the center and is formed with a female screw that engages with a male screw formed on the suspension bolt 2. The angle member 32 has two tip portions projecting outside the mounting portion 31, and the two projecting portions pivotally support the pair of connecting arms 33 and 34 so as to be swingable. The connecting arm 33 is attached to a protruding portion of the angle member 32 at a base end portion thereof by a connecting member 33a such as a bolt so as to be swingable. The connecting arm 34 is attached to the other protruding portion of the angle member 32 with a base end portion thereof that can be swung by a connecting member 34a such as a bolt. The pivot shaft on which the connecting arm 33 swings and the pivot shaft on which the connecting arm 34 swings are orthogonal to each other. The connecting arms 33 and 34 are configured as L-shaped arms whose tips are bent by 90 °. The connecting arm 33 has a hole 33c for inserting the brace 4 into a flat plate portion 33b formed by bending the tip into an L shape. The connecting arm 34 is also the same, and has a hole 34c for inserting the brace 4 into a flat plate portion 34b formed by bending the tip into an L shape. These holes 33c and 34c are configured as circular holes having an inner diameter slightly larger than the outer diameter of the brace 4, for example. The brace connecting portion 3 having the above-described configuration is attached in advance to two predetermined positions at the upper and lower portions of the suspension bolt 2 by screwing the suspension bolt 2 into the screw hole 31a formed in the attachment portion 31.

  FIG. 3 is an enlarged view showing a portion where the first and second brace coupling portions 3 a and 3 b are attached in the hanging metal fitting 1. As shown in FIG. 3A, the first brace connecting portion 3a attached to the upper portion of the suspension bolt 2 is attached at a position where the upper end portion 21 of the suspension bolt 2 protrudes upward by a predetermined length L1. The predetermined length L1 is adjusted in advance as a length necessary for temporarily fixing at least the screw hole 9a provided in the ceiling slab, for example, when the hanging metal fitting 1 is attached to the ceiling slab. Of the pair of connecting arms 33, 34 provided in the first brace connecting portion 3a, the upper end of the brace 4a is fixed in advance to one connecting arm 33, and the upper end of the brace 4b is fixed to the other connecting arm 34. The part is fixed in advance. More specifically, the upper end portion of the brace 4a is inserted into a hole 33c provided in the flat plate portion 33b of the connecting arm 33, and a plurality of nuts 5 are fastened with the flat plate portion 33b interposed therebetween. It is fixed to the arm 33. The same applies to the brace 4b. The upper end portion of the brace 4b is inserted into a hole 34c provided in the flat plate portion 34b of the connecting arm 34, and a plurality of nuts 5 are fastened with the flat plate portion 34b interposed therebetween, whereby the connecting arm 34 is fixed. Fixed. In this way, the braces 4a and 4b are fixed to the connecting arms 33 and 34 by the plurality of nuts 5, so that the upper ends of the braces 4a and 4b are positioned with respect to the connecting arms 33 and 34. Is done. Therefore, it is possible to prevent the braces 4a and 4b from sliding up and down with respect to the flat plate portions 33b and 34b in a state where the braces 4a and 4b are attached to the connecting arms 33 and 34.

  On the other hand, the second brace connecting portion 3b attached to the lower portion of the suspension bolt 2 is at a position where the lower end portion 22 of the suspension bolt 2 protrudes downward by a predetermined length L2 as shown in FIG. It is attached. The predetermined length L2 is adjusted in advance to a length necessary for attaching a ceiling structure such as an air conditioner. The pair of connecting arms 33 and 34 provided on the second brace connecting portion 3b constitute the hanging bracket 1 in a state where the brace 4 is not connected as shown in FIG.

  Next, the construction procedure when constructing the hanging bracket 1 as described above on the ceiling slab will be described. FIG. 4 is a diagram illustrating a construction example of the hanging metal fitting 1. First, the worker puts the above-described hanging metal fitting 1 on a self-propelled lift truck or the like and ascends to a position near the ceiling slab 101. For example, the ceiling slab 101 to be constructed is formed on the upper side of the deck plate 100. The insert 9 is installed in the deck plate 100 in advance at the position where the hanging bracket 1 is installed. When the ceiling slab 101 is placed on the top surface of the deck plate 100, the insert 9 is embedded in the ceiling slab 101. . The insert 9 has a screw hole 9 a opened in the space below the deck plate 100. Such screw holes 9a are provided in advance at a plurality of locations corresponding to positions where the ceiling structure is to be installed.

  An operator installs the hanging metal fitting 1 on one of the plurality of screw holes 9a provided in the ceiling slab 101 in a state of riding on a self-propelled lift vehicle. That is, the operator inserts the upper end 21 into the screw hole 9a while temporarily holding the lower end 22 of the suspension bolt 2, and further temporarily rotates the lower end 22 in the clockwise direction (R direction). The upper end 21 of the suspension bolt 2 is screwed into the screw hole 9a to fix the suspension bolt 2 to the screw hole 9a. At this time, by using a tool that chucks and rotates the lower end portion 22 of the suspension bolt 2, the operator can easily insert the upper end portion 21 of the suspension bolt 2 into the screw hole 9a and fix it. Since the first and second brace coupling portions 3a and 3b that are mounted in advance on the suspension bolt 2 are screwed to the suspension bolt 2, when the suspension bolt 2 is rotated by an operator, the suspension bolt 2 is The screw holes 31a provided in the first and second brace coupling portions 3a and 3b are screwed upward. Therefore, even when the brace coupling portions 3 a and 3 b are attached to the suspension bolt 2 in advance, the upper end portion 21 of the suspension bolt 2 can be embedded in the screw hole 9 a of the ceiling slab 101.

  Next, an operator constructs another hanging bracket 1 in the same manner as described above for another screw hole 9 a provided in the ceiling slab 101. Thereby, as shown in FIG. 5, it will be in the state by which the two suspension metal fittings 1 were attached with respect to the ceiling slab 101. FIG. In the state shown in FIG. 5, the brace connecting portions 3 are already attached to the two upper and lower portions of the two suspension bolts 2, and the braces 4 a and 4 b are already attached to the brace connecting portion 3 a attached to the upper portion of the suspension bolt 2. It is attached. Therefore, the operator does not need to perform the work of separately attaching the brace connecting portion 3 to the suspension bolt 2 after fixing the suspension fitting 1 to the ceiling slab 101, so that the work efficiency is improved.

  Subsequently, the operator has provided the lower end portion of the brace 4b attached to the first suspension fitting 1a in advance between the two suspension fittings 1 fixed to the ceiling slab 101 on the second suspension fitting 1b. It connects with respect to the connection arm 33 of the 2nd brace connection part 3b. That is, the operator inserts the lower end portion of the brace 4b into the hole 33c provided in the flat plate portion 33b of the connecting arm 33, and fastens the two nuts 6 and 7 with the flat plate portion 33b interposed therebetween as shown in FIG. By doing so, the lower end part of the brace 4b is fixed to the 2nd brace connection part 3b provided in the lower part of the 2nd suspension metal fitting 1b. At this time, by using a half nut as the nut 7 to be fastened to the upper portion of the flat plate portion 33b, even if the nut 6 is first attached to the lower portion of the flat plate portion 33b, the nut 7 is provided to the upper portion of the flat plate portion 33b. The work efficiency can be further improved.

  The operator also has a lower end of a brace 4a that is attached in advance to the second hanging bracket 1b of the two hanging brackets 1 fixed to the ceiling slab 101. It connects with respect to the connection arm 34 of the 2 brace connection part 3b. That is, the operator inserts the lower end portion of the brace 4a into the hole 34c provided in the flat plate portion 34b of the connecting arm 34, and fastens the two nuts 6 and 7 with the flat plate portion 34b interposed therebetween as shown in FIG. By doing so, the lower end part of the brace 4a is fixed to the 2nd brace connection part 3b provided in the lower part of the 1st suspension metal fitting 1a. Also at this time, by using a half nut as the nut 7 fastened to the upper portion of the flat plate portion 34b, the working efficiency can be further improved as described above. When this operation is completed, the two braces 4a and 4b are crossed between the two suspension bolts 2, and the vibration of the suspension bolt 2 can be suppressed when an earthquake occurs. And the fixing metal fitting 40 is attached to the crossing part C of the two braces 4a and 4b, and the two braces 4a and 4b are firmly fixed to the crossing part C so as to be in close contact with each other. Thereby, the vibration suppression effect of the suspension bolt 2 is further improved. As the fixing bracket 40, for example, a brace fixing bracket disclosed in JP-A-2015-17391 can be used.

  FIG. 7 shows a state in which four suspension fittings 1a, 1b, 1c, and 1d are constructed on the ceiling slab 101 to support a ceiling structure such as an air conditioner by the above-described work. As shown in FIG. 7, four suspension brackets 1a, 1b, 1c, and 1d are attached to the ceiling slab 101, a total of eight braces 4 are arranged in an oblique direction, and two braces 4 are further intersected. The time required to complete the construction after attaching the fixing bracket 40 is about several minutes to several tens of minutes. That is, in the present embodiment, the brace connecting portion 3 is screwed in advance at two places on the upper and lower sides of the suspension bolt 2, and the upper end portions of the pair of braces 4 are fixed in advance to the upper brace connecting portion 3. Therefore, when attaching the suspension bolt 2 to the screw hole 9a of the ceiling slab 101, it is possible to attach the suspension bolt 2 to the ceiling slab 101 with the brace 4 attached, so that the working efficiency is higher than in the past. This is a significant improvement. Then, as shown in FIG. 8, all work is completed by attaching ceiling structures, such as an air conditioner, to the lower end part of the four suspension bolts 2. FIG.

  As described above, the suspension bracket 1 according to the present embodiment has the brace connecting portions 3 for connecting the braces 4 to the upper and lower portions of the suspension bolt 2 having the external threads formed on the outer peripheral surface in advance. The upper end portions of the pair of braces 4 are fixed in advance to the brace connecting portion 3 a attached to the upper end side of the pair 2. Therefore, when attaching the suspension bolt 2 to the screw hole 9a of the ceiling slab 101, the brace connecting portion 3 and the pair of braces 4 can be attached integrally. And since the brace connection part 3 is attached in the state screwed in the external screw formed in the outer peripheral surface of the suspension bolt 2, when screwing the suspension bolt 2 into the screw hole 9a of the ceiling slab 101, the brace connection part of two places up and down is provided. 3 can be screwed in without rotating with the suspension bolt 2, and the workability is excellent. Therefore, the hanging metal fitting 1 of the present embodiment has an advantage that it is possible to complete the construction with fewer steps than before, and the working time can be greatly shortened.

  Further, in the hanging metal fitting 1 of the present embodiment, when the brace 4 is fixed to the connecting arms 33 and 34, a plurality of nuts 5, 5 or 6, 7 are fastened with the flat plate portions 33b and 34b interposed therebetween. Therefore, the brace 4 is fixed in a state where the brace 4 is positioned so as not to slide with respect to the flat plate portions 33b and 34b of the connecting arms 33 and 34. In particular, the brace 4 can be moved during the transportation of the hanging bracket 1 by firmly tightening the plurality of nuts 5 and 5 in advance at the upper part of the suspension bolt 2 with the flat plate portions 33b and 34b of the first brace coupling portion 3a interposed therebetween. Since it does not detach | leave from the holes 33c and 34c of the flat plate portions 33b and 34b, there is an advantage that it is easy to carry and carry.

  The nut 7 described above may not be a half nut but may be attached to the braces 4a and 4b in advance. In that case, the work of attaching the nut 7 to the braces 4a and 4b during construction of the hanging metal fitting 1 can be omitted, so that the work efficiency is further improved.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG.9 and FIG.10 is a figure which shows the hanging metal fitting 10 in 2nd Embodiment. The hanging bracket 10 is also a bracket that is attached to the ceiling slab and supports the ceiling structure such as an air conditioner in a suspended state. The hanging bracket 10 of the present embodiment is obtained by connecting the two hanging brackets 1 described in the first embodiment in combination in advance. That is, the hanging metal fitting 10 includes a first hanging metal fitting 1a (hereinafter simply referred to as “first metal fitting 1a”) and a second hanging metal fitting 1b (hereinafter simply referred to as “second metal fitting 1b”). Have

  The first metal fitting 1a has a first suspension bolt 2a having a male screw formed on the outer peripheral surface, and a pair of swingable members attached to the male screw at the top of the first suspension bolt 2a. A first brace connecting portion 3a having connecting arms 33, 34 and a first connecting arm 33, 34 having a pair of swingable connecting arms 33, 34 attached to a male screw at the lower portion of the first suspension bolt 2a. 2 brace connecting portions 3b and a pair of braces 4a and 4b whose upper ends are fixed in advance to each of the pair of connecting arms 33 and 34 provided in the first brace connecting portion 3a.

  Similarly to the first metal fitting 1a, the second metal fitting 1b is also in a state of being engaged with the male screw at the upper part of the second suspension bolt 2b, the second suspension bolt 2b having a male screw formed on the outer peripheral surface. The third brace connecting portion 3c having a pair of swingable connecting arms 33, 34 attached to the head and attached to the male screw at the lower part of the second suspension bolt 2b and swingable. A pair of braces whose upper ends are fixed in advance to each of a fourth brace connecting portion 3d having a pair of connecting arms 33, 34 and a pair of connecting arms 33, 34 provided in the third brace connecting portion 3c. 4c and 4d.

  In the hanging metal fitting 10 of this embodiment, the lower end portion of one brace 4b of the pair of braces 4a and 4b provided on the first metal fitting 1a is provided on the fourth brace connecting portion 3d of the second metal fitting 1b. The lower end of one brace 4c of the pair of braces 4c, 4d provided on the second fitting 1b is attached to one of the pair of connecting arms 33, 34, and the first fitting 1a. It is the structure with which one connection arm 34 of a pair of connection arms 33 and 34 provided in the 2nd brace connection part 3b was mounted | worn.

  More specifically, the brace 4b fixed to the upper part of the first metal fitting 1a is provided on the connection arm 33 of the fourth brace connection part 3d provided at the lower end thereof at the lower part of the second metal fitting 1b. The flat plate portion 33b is inserted into the hole 33c. Then, as shown in FIG. 9, the nut 6 is mounted in advance on the tip portion 41 of the brace 4b at a position spaced from the flat plate portion 33b, and the nut 7 is provided on the opposite side of the nut 6 with the flat plate portion 33b interposed therebetween. This is a pre-installed configuration. Similarly, the brace 4c connected to the upper part of the second metal fitting 1b has a flat plate part provided on the connection arm 34 of the second brace connection part 3b provided at the lower end thereof at the lower part of the first metal fitting 1a. It is inserted into the hole 34c of 34b. As shown in FIG. 9, the nut 6 is mounted in advance on the tip 41 of the brace 4c at a position separated from the flat plate portion 34b, and the nut 7 is placed on the opposite side of the nut 6 across the flat plate portion 34b. This is a pre-installed configuration. By attaching the nut 6 in advance to the tip 41 of the braces 4b and 4c, it is possible to prevent the lower ends of the braces 4b and 4c from being detached from the holes 33c and 34c of the connecting arms 33 and 34.

  Since the connecting arms 33 and 34 to which the braces 4b and 4c are connected can swing as described above, when the two suspension bolts 2a and 2b are pulled away from each other as shown by an arrow F1 in FIG. The hanging metal fitting 10 can be developed as shown in FIG. If the distance between the two suspension bolts 2a and 2b is increased beyond a certain level, the nut 6 attached to the lower ends of the braces 4b and 4c serves as a stopper, so that the lower ends of the braces 4b and 4c are connected to the connecting arms 33 and 34. It does not come out of the holes 33c and 34c. Further, when the distance between the two suspension bolts 2a and 2b is reduced as shown by the arrow F2 from the expanded state as shown in FIG. 10, the suspension fitting 10 can be folded into a compact state as shown in FIG. . Therefore, when transporting the suspension fitting 10, it can be conveyed relatively easily if the suspension fitting 10 is folded as shown in FIG. Note that the distance between the nut 6 and the nut 7 that is mounted in advance on the braces 4b and 4c is a flat plate when the form of the hanging bracket 10 is changed between the folded state shown in FIG. 9 and the unfolded state shown in FIG. The braces 4b and 4c are adjusted in advance to a predetermined interval or more so that they can slide loosely in a state where the braces 4b and 4c are inserted into the holes 33c and 34c without interfering with the portions 33b and 34b.

  Next, the construction procedure when constructing the above-described hanging metal fitting 10 on the ceiling slab will be described. FIG. 11 is a diagram illustrating a construction example of the hanging bracket 10. First, the worker puts the above-described suspension metal fitting 10 on a self-propelled lift vehicle or the like and ascends to a position near the ceiling slab 101. Then, the operator unfolds the suspension fitting 10 in a state of riding on a self-propelled lift vehicle, and constructs the suspension fitting 10 for the plurality of screw holes 9 a provided in the ceiling slab 101. That is, the operator inserts the upper end 21 of one suspension bolt 2a into the first screw hole 9a while temporarily holding the lower ends 22 of the two suspension bolts 2a and 2b, and then temporarily fixes the other suspension bolt 2a. The upper end 21 of the suspension bolt 2b is inserted into the second screw hole 9a and temporarily fixed. Thereafter, the operator uses a tool or the like to rotate the lower end portions 22 of the two suspension bolts 2a and 2b in the clockwise direction (R direction), thereby causing the upper end portions 21 of the suspension bolts 2a and 2b to move to the respective screw holes. The suspension bolts 2a and 2b are fixed to the ceiling slab 101 by being screwed into 9a. Since the brace connecting portions 3a, 3b, 3c, 3d, which are mounted in advance on the suspension bolts 2a, 2b, are screwed onto the suspension bolts 2a, 2b, the suspension bolts 2a, 2b are rotated by the operator. Then, the suspension bolts 2a and 2b are screwed upward through the screw holes 31a provided in the brace connecting portions 3a and 3b or 3c and 3d. At this time, the brace connecting portions 3a, 3b, 3c, 3d do not rotate with the suspension bolts 2a, 2b. Therefore, even when the brace connecting portions 3a, 3b, 3c, 3d are attached to the suspension bolts 2a, 2b in advance, the upper end portions 21 of the suspension bolts 2a, 2b are embedded in the screw holes 9a of the ceiling slab 101. be able to. In this embodiment, when the two suspension bolts 2a and 2b are fixed to the ceiling slab 101, the two braces 4b and 4c cross each other between the two suspension bolts 2a and 2b.

  Subsequently, the worker performs an operation of fixing the lower ends of the two braces 4b and 4c. In the present embodiment, the lower ends of the braces 4b and 4c are inserted in advance into holes 33c and 34c provided in the connecting arms 33 and 34, and the nuts 6 are attached to the tips 41 in advance. A nut 7 is attached to the center of 4b and 4c. Therefore, when fixing the lower end portions of the two braces 4b and 4c, the operator may tighten the nuts 6 and 7 that are previously attached to the braces 4b and 4c. That is, by tightening the two nuts 6 and 7 that are mounted in advance, the lower ends of the braces 4b and 4c can be firmly fixed to the flat plate portions 33b and 34b of the connecting arms 33 and 34. The lower ends of the braces 4b and 4c can be fixed more efficiently than in the first embodiment. The nut 7 may be a half nut as described in the first embodiment. However, in the case of a half nut, a process of attaching the nut 7 to the braces 4b and 4c is necessary, so it is preferable to attach the nut 7 in advance. Then, the crossing part C is firmly fixed by attaching the fixing bracket 40 described above to the crossing part C of the two braces 4b and 4c. As a result, as in FIG. 6, since the two braces 4b and 4c are fixed in a crossed manner between the two suspension bolts 2a and 2b, the vibration of the suspension bolts 2a and 2b is suppressed when an earthquake occurs. Will be able to.

  For example, when it is necessary to attach four suspension bolts to support a ceiling structure such as an air conditioner, the above-described operation is performed once again on another suspension bracket 10 and between the two suspension brackets 10. By crossing the braces 4, the suspension fitting 10 can be constructed in the state shown in FIG. And in this embodiment, since the number of processes can be reduced as compared with the first embodiment, the work time required for construction in the state shown in FIG. 7 can be made shorter than in the case of using the hanging metal fitting 1 of the first embodiment. Work efficiency can be further improved.

  As described above, the hanging metal fitting 10 of this embodiment is obtained by assembling and integrating the first metal fitting 1a and the second metal fitting 1b in advance, and a pair of braces 4a fixed to the upper part of the first metal fitting 1a. , 4b, the lower end of one brace 4b is attached in advance to one connecting arm 33 of the pair of connecting arms 33, 34 provided at the lower portion of the second metal fitting 1b, and the second metal fitting 1b. The lower end portion of one brace 4c of the pair of braces 4c, 4d provided in the base is mounted in advance on one of the pair of connection arms 33, 34 provided at the lower portion of the first metal fitting 1b. It is a configuration. Therefore, in this embodiment, after fixing the two suspension bolts 2a and 2b to the screw holes 9a of the ceiling slab 101, the lower ends of the braces 4b and 4c are inserted into the holes 33c and 34c of the connecting arms 33 and 34 and attached. Since it is not necessary to perform the operation | work to perform, it can construct more efficiently than the case where the hanging metal fitting 1 of 1st Embodiment is used. That is, the hanging metal fitting 10 of the present embodiment can not only complete the construction with fewer steps than conventional, but also can reduce the number of steps as compared with the hanging metal fitting 1 of the first embodiment, so that the working time can be remarkably shortened. There is an advantage.

(Modification)
As mentioned above, although several embodiment regarding this invention was described, this invention is not limited to what was demonstrated in the said embodiment, A various modification is applicable.

  For example, although the case where the holes 33c and 34c provided in the connecting arms 33 and 34 of the brace connecting portion 3 are circular holes is illustrated in the above embodiment, the present invention is not limited thereto, and for example, the flat plate portions 33b and 34b. It may be a U-shaped hole (notched opening) formed by notching in a U-shape from the peripheral edge of each other. For example, in the brace connection part 3 provided in the lower part of the suspension bolt 2, the holes 33c and 34c provided in the connection arms 33 and 34 may be U-shaped holes. In this case, when the brace 4 is disposed in an oblique direction, the brace 4 can be mounted from the notch portion of the U-shaped hole to the inner portion of the U-shaped hole, so that the mounting work of the brace 4 is simplified. In this case, since the nuts 6 and 7 can be attached in advance to the lower end of the brace 4 that is not attached in advance to the brace connecting part 3 provided at the lower part of the suspension bolt 2, work efficiency is improved. Further improvement. However, in the second embodiment, the connection arms 33 and 34 to which the lower ends of the braces 4b and 4c are attached in advance are formed by forming the holes 33c and 34c as circular holes in order to prevent the braces 4b and 4c from being detached. It is preferable to keep.

  Moreover, you may comprise the hanging metal fitting which assembled | attached four hanging metal fittings 1 demonstrated in 1st Embodiment previously in bowl shape. However, when the four hanging brackets 1 of the first embodiment are assembled, the weight of the hanging bracket itself is increased, and a relatively large work space is required when the hanging bracket is unfolded and fixed to the ceiling slab. Therefore, from the viewpoint of ease of conveyance and work efficiency, as described in the second embodiment, the hanging metal fitting 10 in which two hanging metal fittings 1 described in the first embodiment are assembled has the highest work efficiency. It is a thing.

1,10 Suspension bracket 1a, 1b Suspension bracket (bracket)
2 (2a, 2b) Suspension bolt 3 (3a, 3b, 3c, 3d) Brace connecting part 4 (4a, 4b, 4c, 4d) Brace 5, 6, 7 Nut 33, 34 Connecting arm 33b, 34b Flat plate part 33c, 33d hole

Claims (7)

A suspension bolt having a male screw formed on the outer peripheral surface;
A first brace connecting portion having a pair of connecting arms attached to the male screw on the upper end side of the suspension bolt and swingable;
A second brace connecting portion having a pair of connecting arms which are attached to the male screw at the lower end side of the suspension bolt and are swingable;
A pair of braces whose upper end portions are fixed in advance to each of the pair of connecting arms provided in the first brace connecting portion;
A hanging metal fitting characterized by comprising. The connection arm provided in each of the first and second brace connection portions has a flat plate portion whose tip is bent in an L shape, and a hole through which the brace is inserted is formed in the flat plate portion. And
The pair of braces have upper ends inserted through the holes of the flat plate portion provided in each of the pair of connection arms of the first brace connection portion, and the connection arms with a plurality of nuts sandwiching the flat plate portion. The hanging metal fitting according to claim 1, wherein the hanging metal fitting is fixed to the frame. It is a construction method of a hanging metal fitting constructed using a plurality of the hanging metal fittings according to claim 1,
An upper end portion of the suspension bolt provided on the first suspension fitting among the plurality of suspension fittings is screwed into a first screw hole provided on the ceiling slab so that the first suspension fitting is mounted on the ceiling. Fixing to the slab,
An upper end portion of the suspension bolt provided on the second suspension fitting among the plurality of suspension fittings is screwed and inserted into a second screw hole provided on the ceiling slab to thereby attach the second suspension fitting to the ceiling. Fixing to the slab;
Connecting and fixing the lower end of one brace of the pair of braces provided on the first suspension fitting to the second brace connection portion of the second suspension fitting;
Connecting and fixing the lower end of one brace of the pair of braces provided on the second suspension fitting to the second brace connection portion of the first suspension fitting;
A method for constructing a hanging metal fitting, comprising: A hanging bracket having a first bracket and a second bracket,
The first metal fitting is
A first suspension bolt having a male screw formed on the outer peripheral surface;
A first brace connecting portion attached to the male screw on the upper end side of the first suspension bolt and having a pair of swingable connecting arms;
A second brace connecting portion attached to the male screw on the lower end side of the first suspension bolt and having a pair of swingable connecting arms;
A pair of braces whose upper end portions are fixed in advance to each of the pair of connecting arms provided in the first brace connecting portion;
With
The second metal fitting is
A second suspension bolt having a male screw formed on the outer peripheral surface;
A third brace connecting portion attached to the male screw on the upper end side of the second suspension bolt and having a pair of swingable connecting arms;
A fourth brace connecting portion attached to the male screw on the lower end side of the second suspension bolt and having a pair of swingable connecting arms;
A pair of braces whose upper end portions are fixed in advance to each of the pair of connecting arms provided in the third brace connecting portion;
With
A lower end portion of one brace of the pair of braces provided on the first metal fitting is attached to one of the pair of connection arms provided on the fourth brace connection portion of the second metal fitting. The lower end of one brace of the pair of braces provided on the second metal fitting is attached to one of the pair of connection arms provided on the second brace connection portion of the first metal fitting. A hanging bracket characterized by being made. The connection arm provided in each of the first to fourth brace connection portions has a flat plate portion whose tip is bent in an L shape, and a hole through which the brace is inserted is formed in the flat plate portion. And
The pair of braces provided in each of the first and second metal fittings are inserted into the holes of the flat plate portions provided in the pair of connection arms of the first and third brace connection portions, respectively. The suspension bracket according to claim 4, wherein the suspension bracket is fixed to the connection arm with a plurality of nuts with the flat plate portion interposed therebetween. The one brace of the pair of braces provided on the first metal fitting is one of the pair of connection arms provided at a lower end portion thereof on the fourth brace connection part of the second metal fitting. While being inserted into the hole provided in the flat plate portion, a nut is mounted at a position separated from the flat plate portion on the tip side,
The one brace of the pair of braces provided on the second metal fitting has one lower end portion of the pair of connection arms provided on the second brace connection portion of the first metal fitting. 6. The suspension bracket according to claim 5, wherein a nut is inserted into a position that is inserted through the hole provided in the flat plate portion and is separated from the flat plate portion on the distal end side. It is a construction method of the hanging metal fitting in any one of Claims 4 thru | or 6, Comprising:
Fixing the first suspension bolt to the ceiling slab by screwing and inserting an upper end portion of the first suspension bolt provided in the first metal fitting into a first screw hole provided in the ceiling slab; ,
Fixing the second suspension bolt to the ceiling slab by screwing and inserting an upper end portion of the second suspension bolt provided in the second metal fitting into a second screw hole provided in the ceiling slab; ,
Fixing a lower end portion of one brace of the pair of braces provided on the first metal fitting to one connecting arm of the fourth brace connecting portion that is attached in advance;
Fixing a lower end portion of one brace of the pair of braces provided on the second metal fitting to one connecting arm of the second brace connecting portion mounted in advance;
A method for constructing a hanging metal fitting, comprising:

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