JP7576243B2 - Sway prevention bracket for channel steel - Google Patents

Description

The present invention relates to a sway prevention bracket for channel steel that is supported by hanging bolts suspended from a ceiling slab and on which long materials such as cable racks and electrical conduits are placed and fixed at appropriate intervals when installing them under a ceiling slab. The sway prevention bracket is used to attach sway prevention bolts to the channel steel to suppress sway caused by earthquakes, etc.

Conventionally, when attaching a sway-stop bolt to a channel steel supported by a suspension bolt suspended from a ceiling slab, it was necessary to prepare a connecting fitting separately, and the procedure was as follows.
First, with a tightening nut D and an attachment cover 60 attached by inserting it through the through hole placed on the hanging bolt B, a locking nut that engages with both opening pieces of the channel steel A is screwed onto the lower end of the hanging bolt, the channel steel is attached to the hanging bolt via the locking nut, the attachment cover 60 is attached to the opening surface of the channel steel facing upward, and the tightening nut D is tightened to secure it in place.
Alternatively, with a tightening nut D and an attachment cover 60 attached by inserting it through a through hole placed on the hanging bolt B, a channel steel having through holes on both sides is inserted through the through holes, a receiving nut is screwed on from below and attached to the hanging bolt, the attachment cover is attached to the opening surface of the channel steel A facing upward, and the tightening nut D is tightened to secure it in place.
Next, a connecting metal fitting 70 for mounting an anti-sway bolt C disposed obliquely relative to the hanging bolt B is attached to the hanging bolt B, and the anti-sway bolt C is attached and connected to the connecting metal fitting 70 (see FIG. 8).

Various types of connecting fittings have been disclosed to date. For example, Patent Document 1 discloses a device in which a pair of fixing plates are sandwiched and overlapped on both sides of a hanging bolt fixed to a channel steel, and a nut is tightened to secure the plate in place. The anti-sway bolt is then inserted into a through hole provided at the tip of one of the fixing plates which bends outward from the overlapping part, and the nuts are then tightened from both sides.
Furthermore, Patent Document 2 discloses a configuration that includes a base plate and a clamping portion that is attached to the base plate and can clamp and fix a hanging bolt and multiple anti-vibration bolts by tightening a tightening bolt.

Publication number 04-048087 JP 2017-145897 A

In all of the above conventional connecting fittings, the connecting fitting is attached after a channel steel is attached to the hanging bolt. In other words, three work steps are required: a step of attaching the channel steel to the hanging bolt, a step of attaching the connecting fitting to the hanging bolt, and a step of attaching the anti-sway bolt to the connecting fitting. This increases the number of work steps and hinders labor savings.
Furthermore, the structure of the connecting fittings themselves is complex, which makes installation time-consuming.

The present invention has been developed in consideration of the above-mentioned conventional problems, and aims to provide a sway prevention bracket for channel steel that allows a connecting bracket for attaching an anti-sway bolt to be attached at the same time when attaching a channel steel to a hanging bolt, and also makes it easy to attach the channel steel by making it possible to temporarily fasten it to the hanging bolt.

As a means for achieving this, claim 1 of the present invention is a sway-prevention bracket for a channel steel that is attached to a hanging bolt suspended from a ceiling slab and is used to attach an anti-sway bolt arranged diagonally relative to the hanging bolt to a channel steel on which a long material is placed and fixed, and is characterized in that it comprises an attachment member that is attached to the opening side of the channel steel, and an oblique support material whose base is overlapped with the attachment member and has a connection portion at its tip to which the anti-sway bolt is connected, and a through hole through which the hanging bolt is inserted is provided in the overlapping portion between the attachment member and the base of the oblique support material, and a ring-shaped connecting member is provided that fits into the through hole so that the two are connected freely rotatably.

A second aspect of the present invention is characterized in that a plurality of protruding pieces are provided on the inner peripheral surface of the connecting material, the protruding pieces extending toward the center.

According to the invention of claim 1, the diagonal support material for attaching the anti-sway bolt to the mounting member attached to the opening side of the channel steel is connected and integrated with a ring-shaped connecting material, so that in the process of attaching the channel steel to the hanging bolt, the diagonal support material which serves as a connecting fitting is attached to the hanging bolt.
In other words, the work consists of two steps: attaching the channel steel to the hanging bolt and attaching the anti-sway bolt to the diagonal support material that serves as the connecting fitting. This reduces the labor required for the work process, thereby improving work efficiency.

According to the invention of claim 2, the protruding piece provided on the inner surface of the connecting material engages with the threads of the hanging bolt to temporarily secure it, allowing the user to release the bolt for a moment, making it easier to install the channel steel and improving work efficiency.

1A is a front perspective view of an embodiment of the present invention, and FIG. 1B is a rear perspective view of the embodiment. FIG. 2 is an exploded explanatory view of the channel steel vibration prevention bracket of FIG. 1. FIG. 2 is a central cross-sectional view of the channel steel vibration brace of FIG. 1 . FIG. 11 is a perspective view showing another embodiment of the diagonal support member of the present invention. 2 is an explanatory diagram showing a procedure for installing the channel steel sway brace of FIG. 1. FIG. FIG. 2 is a perspective view showing a state in which the channel steel sway brace of FIG. 1 is used. FIG. 13 is a perspective view showing a case where two oblique support members of the present invention are used. FIG. 11 is a perspective view showing a conventional example.

An embodiment of a sway brace for channel steel of the present invention will be described with reference to the drawings.
As shown in Figs. 1 to 4, the anti-sway fitting for channel steel of the present invention comprises a mounting member 10, a diagonal support member 20, and a connecting member 30 which can connect the two together rotatably.
The mounting member 10 is made of a thin steel plate having a generally U-shape so as to fit onto the short side of the opening of the channel steel A, and has a first through hole 11 in the center through which the hanging bolt B is inserted.
The diagonal support member 20 is integrally formed from thin strip steel, via a connecting piece 24 that is bent so as to extend diagonally relative to the hanging bolt B, and includes a base 22 having a second through hole 21 of the same diameter as the first through hole 11 of the mounting member, and a connection portion 23 at the tip of which an anti-vibration bolt C is connected.
A notch 25 with a width slightly larger than the outer diameter of the anti-sway bolt C is formed in the connection portion 23, and the anti-sway bolt C with a pair of tightening nuts D screwed onto it is inserted into the notch 25 between the tightening nuts D, and the anti-sway bolt C can be connected by tightening the pair of tightening nuts D from both sides.
Further, a cut-out portion 26 is formed on the opening side of the cutout portion 25, against which the tightening nut D abuts to prevent the anti-vibration bolt C from coming loose.

As another embodiment of the diagonal support member, as shown in FIG. 4, a form (a) is adopted in which an anti-sway bolt C is inserted into a notch 41 provided in the diagonal support member 40, and the anti-sway bolt C is pressed by a tightening bolt 42 from a direction perpendicular to the anti-sway bolt C to fix the support member. Alternatively, a form (b) is adopted in which an oblique support member 50, a clamping member 51 provided with a notch 52 that engages with the outer periphery of the anti-sway bolt C, a tightening bolt 53, and a coil spring 54 exteriorly mounted on the tightening bolt 53 are provided, and the coil spring 54 is attached to the clamping member 51 in a direction that presses the anti-sway bolt C. The anti-sway bolt C can be temporarily fixed by applying pressure, and the clamping bolt 53 can be tightened to fix the anti-sway bolt C as a whole (b). In both (a) and (b), the anti-sway bolt C can be fixed by simply tightening the clamping bolts 42, 53, without using a pair of clamping nuts D, thereby simplifying and streamlining the work. Furthermore, in (b), the clamping member 51 can be rotatable around the clamping bolt 53 as an axis, which makes it easy to adjust the angle of the anti-sway bolt C, thereby further improving the work efficiency. Note that the configuration of the above-mentioned embodiments of the diagonal support material according to the present invention is not particularly limited, and any configuration that can fix the anti-sway bolt will suffice.

The connecting material 30 has a ring-shaped main body 31 on one side which has a flange portion 32 formed around the entire circumference and which has a diameter larger than the inner diameter of the second through hole of the diagonal support material 20, and on the other side which has a locking claw 33 formed integrally from synthetic resin which protrudes outward from the main body 31 along the periphery.
The base 22 of the diagonal support material 20 is laminated onto the upper surface of the mounting member 10, and the first through holes 11 and second through holes 21 are connected to form an insertion hole 35 for the hanging bolt B. The connecting material 30 is then pressed into the inside of the insertion hole 35, so that the flange portion 32 abuts against the peripheral edge of the second through hole 21 of the diagonal support material 20 and the locking claw 33 locks onto the peripheral edge of the back side of the first through hole 11 of the mounting member 10, thereby connecting the mounting member 10 and the diagonal support material 20 in a freely rotatable manner.
By forming multiple protruding pieces 34 toward the axial center on the inner surface of the ring-shaped main body 31 of the connecting material 30, the protruding pieces 34 can be temporarily fixed by engaging with the threads of the hanging bolt B when the hanging bolt B is inserted.

The manner of use of the thus constructed channel steel vibration brace will be described along with the installation procedure with reference to FIG.
(a) A pair of hanging bolts B suspended from the ceiling slab so as to be positioned at both ends of the channel steel A are fitted with tightening nuts D screwed onto the lower end of each bolt, and the anti-sway bracket for channel steel of the present invention is inserted through the insertion hole 35 and attached to the desired height. However, the protruding piece 34 on the inner surface of the connecting material 30 engages with the threads of the hanging bolts B, creating a temporary fastening state, and the bolts can be released for the time being.
(b) A channel steel A has holes A1 formed in the bottom surface on both sides, and hanging bolts B are inserted into the holes A1.
(c) The receiving nut E is screwed from below and attached to the hanging bolt, and the mounting member 10 is moved and attached to the opening surface of the channel steel facing upward, and the clamping nut D is tightened to secure it in place.
(d) The anti-sway bolt C, with a pair of tightening nuts D screwed into it, can be connected by inserting it between the tightening nuts D, over the cut-out portion 26, and into the cut-out portion 25 formed in the connection portion 23 of the diagonal support material 20 and fixing it with the tightening nuts D on both sides.
FIG. 6 shows the state in which the cable rack F is placed on the channel steel A to which the suspension bolts suspended from the ceiling slab and the anti-sway bolts are attached in the above-mentioned procedure, and is fixed with the fixing brackets G.

Here, the case where one diagonal support member 20 is used to suppress vibration in a direction perpendicular to the longitudinal direction of the cable rack F has been described. However, as shown in FIG. 7, two diagonal support members 20 are laminated to the mounting member and connected to anti-sway bolts in two directions, forward and backward, along the longitudinal direction of the cable rack F placed on the channel steel A, thereby suppressing vibration in the longitudinal direction.
Furthermore, by stacking the diagonal support members 20 in three layers, it is possible to suppress vibration in three directions, including the two directions and the orthogonal direction (not shown).

10 Mounting member 11 First through hole 20 Diagonal support member 21 Second through hole 22 Base 23 Connection portion 24 Coupling portion 25 Cutout portion 26 Cut-out portion 30 Connecting member 31 Main body 32 Flange portion 33 Locking claw 34 Projecting piece 35 Insertion hole 40 Diagonal support member 41 Cutout portion 42 Fastening bolt 50 Diagonal support member 51 Clamping member 52 Cutout portion 53 Fastening bolt 54 Coil spring 60 Mounting cover 70 Connecting fitting A Channel steel A1 Through hole B Suspension bolt C Vibration prevention bolt D Fastening nut E Receiving nut F Cable rack G Fixing fitting

Claims (2)

This is a sway-proof bracket for channel steel that is attached to a hanging bolt suspended from a ceiling slab and is used to attach an anti-sway bolt that is arranged diagonally with respect to the hanging bolt to a channel steel on which a long material is placed and fixed, characterized in that it comprises an attachment member that is attached to the opening side of the channel steel, and an oblique support material that has a base that overlaps with the attachment member and has a connection portion at its tip to which the anti-sway bolt is connected, and a through hole through which the hanging bolt is inserted is provided at the overlapping portion between the attachment member and the base of the oblique support material, and a ring-shaped connecting member is provided that fits into the through hole so that the two are connected freely rotatably. 2. The anti-sway bracket for channel steel according to claim 1, characterized in that a plurality of protruding pieces are provided on the inner peripheral surface of the connecting material, the protruding pieces extending toward the center.

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