JP7131747B2 - Steel mounting bracket for hanger bolt - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel fitting for hanging bolts for fixing a steel material at an arbitrary height for supporting pipes or the like between hanging bolts suspended from a floor slab or the like in facility construction.

Conventionally, as a metal fitting for attaching a steel material to a suspension bolt suspended from a floor slab or the like, for example, the suspension bolt is sandwiched between a pair of clamping bodies having a semicircular fitting recess, and the clamping body and the steel material are One that supports the steel material on the suspension bolt by tightening with two tightening bolts straddling the suspension bolt (Patent Document 1), and a clamping body that has a clamping surface that covers approximately half of the outer peripheral surface of the suspension bolt. A suspension bolt is clamped by a steel material and tightened with two tightening bolts straddling the suspension bolt, thereby supporting the steel material on the suspension bolt (Patent Document 2), and one of clamping bodies in which a long nut is vertically divided. In addition, a U-bolt is welded, etc., and the suspension bolt is sandwiched with the other clamping body, the threaded part of the U-bolt is passed through the through hole of the steel material, and the nut is tightened to attach the steel material to the suspension bolt. A support (Patent Document 3) is disclosed. In these prior arts, two tightening bolts and nuts are required for fastening the clamping body and the steel material, and four bolts are required to support both ends of the steel material. Therefore, it takes time to install, and work efficiency deteriorates. Since it is necessary to attach the clamping body to the suspension bolt and the clamping body and the steel material at the same time, it is difficult to finely adjust the mounting position of the steel material, resulting in a problem of poor mounting accuracy.

In addition, as an arrangement in which the attachment of the clamping body to the hanging bolt and the attachment of the clamping body and the steel material are performed separately, one end of a pair of clamping bodies obtained by vertically dividing the cylindrical shape into two parts is used as a hinge, and the other end is used as a hinge. By screwing the bolts together, the clamping body is temporarily fixed at an arbitrary height of the suspension bolt, and when the position is determined, the clamping bolt is tightened to fix the clamping body to the suspension bolt, and then to the clamping body It is disclosed to attach a receiving part and insert a pipe into the receiving part. (Patent Document 4)
In Patent Document 4, since the portion of the clamping body that is engaged with the hanging bolt is a pair of nut members that are divided into two parts, it is necessary to carve screws into the clamping body, which requires a member and space. Machining becomes complicated, and since the clamping body is composed of a pivot portion for forming a hinge, a holding means, or a receiving portion into which a pipe is inserted, the number of constituent parts increases and the manufacturing cost increases. In addition, there are many parts to be assembled when installing the holding body and piping, and there is a risk that the parts may fall when working at a high place.

Utility Model Registration No. 3151654 Utility model registration No. 3152477 Patent No. 5729849 Actual open 02-121615

The present invention has been made in view of the above-mentioned conventional problems, and its object is to separate the mounting of the steel mounting bracket to the hanging bolt and the mounting of the steel so that the steel mounting bracket can be temporarily fixed to the hanging bolt. As a result, the steel material can be easily attached to any desired position of the suspension bolt with high precision, and in terms of manufacturing, processing is simple, and the number of parts can be reduced to reduce the manufacturing cost.

As a means therefor, claim 1 of the present invention is for suspension bolts in which a steel material for placing a pipe on a suspension bolt suspended from a floor slab or the like is fixed to a pair of clamping members that clamp the suspension bolt from the outer side in the circumferential direction. A pair of steel fittings, wherein the pair of clamping members are both formed by bending thin steel plates into a substantially U-shape consisting of a base plate and upper and lower side plates, and the upper and lower side plates are respectively attached to one side of the suspension bolt. A clamping concave portion is formed for contacting and clamping, and a first bolt shaft is fixed to one of the substrates to form a first clamping member, and the first bolt shaft of the first clamping member is inserted through the other substrate. The first bolt shaft of the first clamping member is inserted into the through hole of the second clamping member, and the first bolt of the first clamping member is inserted from the outside thereof. A pressing nut that can be advanced and retracted by screwing onto the shaft is screwed on, and the first bolt shaft of the first clamping member is moved so that the first clamping member and the second clamping member on the clamping concave side are separated from each other. The other ends of the first holding member and the second holding member are brought close to each other through the gap between the first holding member and the second holding member . The suspension bolt can be held between the recess and the holding recess of the second holding member.

According to claim 2 of the present invention, in claim 1, a second bolt shaft projecting in a direction opposite to the projecting direction of the first bolt shaft is fixed to the substrate of the first clamping member , and the second bolt shaft It is characterized by providing a tightening nut that can be advanced and retracted by being screwed into it.

According to claim 3 of the present invention, in claim 1 or 2, the upper plates of the first holding member and the second holding member and the lower plates of the first holding member and the second holding member By connecting with a hinge portion, the first clamping member and the second clamping member can freely open and close in the direction of clamping or not clamping the hanging bolt with the hinge portion as a pivot.

According to claim 1 of the present invention, the joint recesses provided in the upper and lower side plates of the first clamping member and the second clamping member clamp the suspension bolt from the side surface, tighten the pressing nut, and hold the suspension bolt at a predetermined position. After fixing the steel material mounting bracket for hanging bolt (hereinafter referred to as this metal fitting), insert the first bolt shaft through a through hole provided at an arbitrary position in the steel material to support it, and tighten the tightening nut on the first bolt shaft. By doing so, the steel material can be fixed to this metal fitting. In other words, it is possible to separate the mounting of the metal fittings to the hanger bolts and the mounting of the steel material, eliminating the need to mount the metal fittings and the steel material to the hanger bolts at once, making it possible to finely adjust the height of the metal fittings. It is easy to install and can improve construction accuracy.

In addition, the parts constituting the metal fitting are a pair of clamping members that are bent into a substantially U-shape by press working.

According to claim 2 of the present invention, since the second bolt shaft projecting in the direction opposite to the projecting direction of the first bolt shaft is fixed to the substrate of the first clamping member , the through hole is provided at an arbitrary position of the steel material. By inserting and tightening with a tightening nut, the steel material can be fixed to this metal fitting.

According to claim 3 of the present invention, the upper side plates of the first holding member and the second holding member and the lower side plates of the first holding member and the second holding member are connected by hinge portions. Therefore, when attaching to the suspension bolt, the first clamping member and the second clamping member can be easily opened and closed in the direction of clamping or not clamping the suspension bolt with the hinge portion as the pivot.

Fig. 2 is a perspective view showing a fitting according to Embodiment 1 of the present invention; Fig. 2 is a side view showing the metal fitting of Embodiment 1 of the present invention; FIG. 4 is an explanatory diagram showing the metal fitting of Embodiment 1 of the present invention; FIG. 4 is an explanatory diagram showing an attached state of the metal fitting according to the first embodiment of the present invention; It is a side view which shows the usage condition of the metal fittings of Embodiment 1 of this invention. FIG. 1 is a view corresponding to FIG. 1 showing a metal fitting according to Embodiment 2 of the present invention. FIG. 3 is a view equivalent to FIG. 3 showing a metal fitting according to Embodiment 2 of the present invention; FIG. 1 is a view corresponding to FIG. 1 showing a metal fitting of Embodiment 3 of the present invention. FIG. 2 is a view equivalent to FIG. 2 showing a metal fitting according to Embodiment 3 of the present invention; FIG. 3 is a view equivalent to FIG. 3 showing a metal fitting according to Embodiment 3 of the present invention; FIG. 5 is a view equivalent to FIG. 4 showing a mounting state of a metal fitting according to Embodiment 3 of the present invention; It is a perspective view which shows the use condition of the metal fitting of Embodiment 3 of this invention. FIG. 11 is a side view showing another usage condition of the fitting according to Embodiment 3 of the present invention;

Embodiments of the present invention will be described in detail with reference to the drawings.
(Embodiment 1)
First, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 5. FIG.
As shown in FIGS. 1 to 3, reference numeral 10 denotes a first clamping member, which is formed by pressing a thin steel plate to form a first substrate 11, a first upper plate 12a, and a first lower plate 12b. The first upper plate 12a and the first lower plate 12b are provided with a substantially semicircular first upper clamping recess 13a and a first lower clamping recess 13b for clamping the outer periphery of the suspension bolt A, respectively. are provided on the same axis. Reference numeral 14 denotes a first bolt shaft which is vertically welded to the base plate 11 of the first holding member 10, and a screw 14a is provided on the tip side thereof. The fixed position of the first bolt shaft 14 is preferably provided as close as possible to the clamped hanging bolt A. This is achieved by shortening the distance between the fixed position of the hanging bolt A and the fixed position of the steel material C to reduce the moment of force. is made small so that the metal fitting 1 can efficiently support the load applied to the steel material C.

Reference numeral 20 denotes a second holding member. A second substrate 21 is formed by bending a thin steel plate by press work so as to have a height that can be accommodated between the first upper side plate 12a and the first lower side plate 12b of the first holding member 10. , a second upper plate 22a, and a second lower plate 22b, forming a substantially U-shape. A second upper clamping recess 23a and a second lower clamping recess 23b are coaxially provided. A long hole 24 is provided in the substrate 21 of the second clamping member 20, and the first bolt shaft 14 of the first clamping member 10 is inserted therethrough. First upper clamping recess 13 a of first clamping member 10 and second upper clamping recess 23 a of second clamping member 20 , first lower clamping recess 13 b of first clamping member 10 and second clamping recess 23 b of second clamping member 20 2. The opening side of the lower clamping recessed portion 23b faces each other, and the hanging bolt A is clamped one by one from the outer side in the circumferential direction. A press nut 30 is screwed onto the screw 14 a of the first bolt shaft 14 while the first bolt shaft 14 is inserted through the long hole 24 .

Although the height between the upper plate 22a and the lower plate 22b of the second holding member 20 has been described here so as to fit between the upper plate 12a and the lower plate 12b of the first holding member 10, the first holding member The height may be the same as that of 10, and the upper and lower side plates may face each other. Conversely, the height between the upper plate 12a and the lower plate 12b of the first holding member 10 may be set to a height that fits between the upper plate 22a and the lower plate 22b of the second holding member 20. The second clamping member 20 and the first clamping member 10 may have the same height, and may be provided so as to overlap each other while being shifted in the vertical direction.
In addition, the clamping recesses 13a, 13b, 23a, and 23b are semicircular in order to clamp the side surface of the suspension bolt A. However, the shape is not limited to this shape, and the recesses 13a, 13b, 23a, and 23b are not limited to this shape. It may be V-shaped, substantially U-shaped, or substantially L-shaped.

Next, the state in which the suspension bolt A is clamped will be described with reference to FIGS. 4(A) to 4(D). As shown in FIG. 4(A), the metal fitting 1 is prepared for the suspension bolt A. As shown in FIG. Then, as shown in FIG. 4B, the second clamping recesses 23a and 23b of the second clamping member 20 facing the first clamping recesses 13a and 13b of the first clamping member 10 are relatively , slightly larger than the outer diameter of the hanging bolt A and moved in the direction of the arrow. Next, as shown in FIG. 4C, the first clamping member 10 and the second clamping member 20 are moved in the arrow direction. Thereby, the first clamping recesses 13a, 13b provided on the first upper and lower side plates 12a, 12b of the first clamping member 10 and the second clamping recesses 13a, 13b provided on the second upper and lower side plates 22a, 22b of the second clamping member 20 are formed. The recesses 23a and 23b for holding the hanging bolt A from the outer side in the circumferential direction. Then, as shown in FIG. 4(D), the hanging bolt A is clamped between the first clamping member 10 and the second clamping member 20, and the pressing nut 30 is tightened to secure the hanging bolt A to a predetermined position. 1 is fixed. After that, as shown in FIG. 5, the first bolt shaft 14 is supported by inserting the through hole C1 provided at an arbitrary position in the steel material C from the outside of the pressing nut 30, and the tightening nut 31 is attached to the first bolt shaft 14. Fasten. By this work, the steel material C can be fixed to the main metal fitting 1 . In other words, the mounting of the metal fitting 1 to the hanging bolt A and the mounting of the steel material C can be separated into separate processes, eliminating the need to mount the metal fitting 1 and the steel material C to the hanging bolt A at once. Fine adjustment of the height of the metal fitting 1 can be easily performed, and construction accuracy can be improved.

The parts constituting the metal fitting 1 consist of a pair of clamping members 10 and 20 bent into a substantially U-shape by press working, a first bolt shaft 14 welded to the first clamping member 10, and a pressing nut 30. It is easy to process, has a small number of parts, and can reduce manufacturing costs. Furthermore, since the metal fitting 1 is assembled and integrated in advance, only the tightening nut 31 for tightening the steel material is separate, and it is not integrated when it is installed at the work site. Since the number of body parts can be reduced, the risk of parts falling during work at height can be reduced, and the metal fitting can be made with safety in mind.

(Embodiment 2)
Embodiment 2 of the present invention will be described with reference to FIGS. 6 and 7. FIG. In the second embodiment, only parts different from the first embodiment will be explained, and explanations of common parts will be omitted.
As shown in FIGS. 6 and 7, the metal fitting 1A of the second embodiment is a second bolt protruding from the substrate 11 of the first clamping member 10 described in the first embodiment in the direction opposite to the direction in which the first bolt shaft 14 protrudes. The difference is that a steel material C is attached to the second bolt shaft 15 as a configuration in which a bolt shaft 15 is provided, a screw 15a is engraved on the tip side thereof, and a tightening nut 32 is screwed. Specifically, the second bolt shaft 15 is formed by inserting a double-threaded bolt having threads on both ends thereof through a through-hole 16 provided in the substrate 11 so that the peripheral edge of the through-hole 16 and the body of the double-threaded bolt are inserted. It is welded and configured integrally with the first bolt shaft 14 .

In the same manner as in Embodiment 1, after clamping the hanging bolt A to the main metal fitting 1A of Embodiment 2, the tightening nut 32 is removed once, the through hole C1 of the steel material C is externally fitted on the second bolt shaft 15, and the steel material C is pressed against the rear surface of the first substrate 11 of the first clamping member 10 and fixed by tightening with the tightening nut 32 .

In the second embodiment, by providing the dedicated second bolt shaft 15 for attaching the steel material C, the attachment position of the metal fitting 1A can be changed by loosening the pressing nut 30 even after the steel material C is attached. Also, it is possible to change the work procedure such that the main metal fitting 1A is temporarily fixed to the steel material C in advance and then the main metal fitting 1A is attached to the suspension bolt A.
In addition, if the first bolt shaft 14 and the second bolt shaft 15 are used, two steel materials can be supported at one place of the main metal fitting, thereby realizing a variety of working methods.

(Embodiment 3)
Embodiment 3 of the present invention will be described with reference to FIGS. 8 to 11. FIG. In the third embodiment, only parts different from the second embodiment will be explained, and explanations of common parts will be omitted.
As shown in FIGS. 8 to 11, reference numeral 100 denotes a first clamping member, which is formed by bending a thin steel plate into a substantially U-shape consisting of a first substrate 110, a first upper plate 120a, and a first lower plate 120b. The first upper plate 120a and the first lower plate 120b are coaxially formed with a substantially semicircular first upper clamping recess 130a and a first lower clamping recess 130b for clamping the hanging bolt A from the outer peripheral side. prepare. Furthermore, an upper hinge elongated hole 181a and a lower hinge elongated hole 181b constituting the hinge portion 180 are provided near one side of the first upper clamping recess 130a and the first lower clamping recess 130b, respectively. Reference numeral 140 denotes a first bolt shaft vertically installed on the first substrate 110 of the first holding member 100, and 150 denotes a second bolt shaft projecting from the first substrate 11 in a direction opposite to the projecting direction of the first bolt shaft 140. be. A screw is formed on the tip side of both, and a tightening nut 320 is screwed onto the second bolt shaft 150 .

Reference numeral 200 denotes a second holding member. A second substrate 210 is formed by bending a thin steel plate by press working so that the height can be accommodated between the first upper side plate 120a and the first lower side plate 120b of the first holding member 100. , a second upper plate 220a, and a second lower plate 220b. The second upper plate 220a and the second lower plate 220b are coaxially provided with a semicircular second upper clamping recess 230a and a second lower clamping recess 230b for clamping the hanging bolt A from the outer peripheral side. . Protruding claws 131a, 131b, 231a, and 231b are formed on the peripheral edges of the first upper clamping recess 130a, the first lower clamping recess 130b, the second upper clamping recess 230a, and the second lower clamping recess 230b. is provided. By providing these protruding claws, the hanging bolt A is engaged with the thread groove and the holding force is improved.
An upper protruding piece 250 a and a lower protruding piece 250 b that constitute the hinge portion 180 are provided on the second holding member 200 . The upper projecting piece 250a and the lower projecting piece 250b are provided by pressurizing and deforming a part of the second upper plate 220a and the second lower plate 220b, respectively. The upper protruding piece 250a and the lower protruding piece 250b are inserted into the upper hinge long hole 181a provided in the first upper plate 120a of the first holding member 100 and the lower hinge long hole 181b provided in the first lower plate 120b, respectively. loosely fitted. The hinge portion 180 is composed of the upper protruding piece 250a and the upper hinge long hole 181a, and the lower protruding piece 250b and the lower hinge long hole 181b. A long hole 240 is provided in the second substrate 210 of the second clamping member 200, through which the first bolt shaft 140 of the first clamping member 100 is inserted.

With respect to the ends of the long hole 240, that is, the hinge portion 180, the first upper clamping recess 130a and the second upper clamping recess 230a, and the first lower clamping recess 130b and the second lower clamping recess 130b clamp the suspension bolt A. A first gripping portion 170 and a second gripping portion 270 are provided on the side opposite to the side gripping concave portion 230b.

Based on FIG. 11, a state of attaching the metal fitting 1B of Embodiment 3 to the suspension bolt A will be described. The details are the same as those in FIG. 4 of Embodiment 1, and only a brief description will be given here.
The opening sides of the first clamping member 100 and the second clamping member 200 of the metal fitting 1B are opposed to each other, the first bolt shaft 140 is inserted through the long hole 240, and the projecting pieces 250a and 250b of the second clamping member 200 are inserted into the first The first holding member 100 and the second holding member 200 are connected by fitting into the elongated hinge holes 181 a and 181 b of the holding member 100 , and the pressing nut 300 is screwed onto the screw of the first bolt shaft 140 together with the washer 330 . do. In this way, the metal fitting 1B is assembled.

When attaching the metal fitting 1B to the suspension bolt A, as shown in FIG. 11, with the pressing nut 300 loosened, the first gripping portion 170 and the second gripping portion 270 are gripped with one hand, and the gripping portions are 170 and 270 are moved in a direction to approach. By this operation, the first clamping recess 130 of the first clamping member 100 and the second clamping recess 230 of the second clamping member 200 are separated from each other with the hinge portion 180 as the pivot, creating a gap into which the hanging bolt A can be inserted. In this state, the hanging bolt A is inserted between the first clamping recess 130 and the second clamping recess 230, and then the pressing nut 300 is tightened. By this operation, the metal fitting 1B can be fixed to the hanging bolt A.

In this case, the hinge portion 180 is formed by combining a through hole and a projecting piece. Alternatively, it can be configured by caulking and fixing. (illustration omitted)
In addition, the clamping recesses 130 and 230 are semicircular in order to clamp the side surface of the suspension bolt A, but similar to the first embodiment, they may be substantially V-shaped, substantially U-shaped, or substantially L-shaped. But it's okay.

Next, the usage method of Embodiment 3 will be described in detail with reference to FIG.
The mounting procedure for attaching this metal fitting to an arbitrary position of one of the hanging bolts A and B for passing the steel material C made of an angle material is to first loosen the pressing nut 300 as appropriate, and , 270 are grasped with fingers and moved in an approaching direction, so that the first clamping recess 130 of the first clamping member 100 and the second clamping recess 230 of the second clamping member 200 are hung with the hinge portion 180 as a pivot. A gap is created through which the bolt A passes. The metal fitting 1B is inserted through the gap, and fingers are released from the grasping portions 170 and 270 of both the holding members 100 and 200. As shown in FIG. The first holding recesses 130, 130 provided in the upper and lower side plates 120, 120 of the first holding member 100 and the first holding recesses 230, 230 provided in the upper and lower side plates 220, 220 of the second holding member 200 are used to By clamping the side surface of the suspension bolt A and tightening the pressing nut 300 screwed onto the first bolt shaft 140, the suspension bolt A can be fixed at an arbitrary position. Similarly, the metal fitting 1B is attached to the other hanger bolt B at the same position as the hanger bolt A.
Next, the tightening nuts 320, 320 of the metal fittings attached to the suspension bolts A, B are once removed, and steel materials C made of angle materials C are provided on the steel materials C on the second bolt shafts 150, 150 of the metal fittings 1B. It is fixed by externally inserting the through hole C1 and tightening with the tightening nuts 320 , 320 .
After that, the piping D is placed on the steel material C and fixed with U bolts E.

In the third embodiment, gripping portions 170 and 270 of both clamping members 100 and 200 are grasped with fingers and moved in the approaching direction, so that first clamping recess 130 of first clamping member 100 and first clamping recess 130 of first clamping member 100 are connected to each other with hinge portion 180 as a pivot. The operation of separating the second clamping recess 230 of the two clamping member 200 and opening it slightly larger than the outer diameter of the suspension bolt can be easily performed with one hand, and the efficiency of the work can be improved.

In the third embodiment, gripping portions 170 and 270 of both clamping members 100 and 200 are grasped with fingers and moved in a direction in which the first clamping recessed portion 130 and the second clamping recessed portion 230 are separated from each other. However, a spring or the like may be provided so that when the fingers are released, the first clamping recess 130 and the second clamping recess 230 are forced to approach each other.

FIG. 13 shows another usage state of the metal fitting of Embodiment 3. As shown in FIG.
As shown in FIG. 13 , a steel material C may be fastened to the first bolt shaft 140 with a fastening nut 310 . If this structure is made like Embodiment 3, two steel materials can be supported per one metal fitting.

1 Hanging bolt steel fitting 1A Metal fitting 1B Metal fitting 10 First clamping member 11 First substrate 12a First upper plate 12b First lower plate 13a First upper clamping recess 13b First lower clamping recess 14 First bolt shaft 14a Screw 15 Second bolt shaft 16 Through hole 20 Second clamping member 21 Second substrate 22a Second upper plate 22b Second lower plate 23a Second upper clamping recess 23b Second lower clamping recess 24 Long hole 30 Pressing nut 31 tightening nut 32 tightening nut 100 first clamping member 110 first substrate 120 first upper and lower side plates 120a first upper plate 120b first lower plate 130 first clamping recess 130a first upper clamping recess 131a protruding claw 130b first lower Side clamping concave portion 131b Projecting claw 140 First bolt shaft 140a Screw 150 Second bolt shaft 160 Through hole 170 First gripping portion 180 Hinge portion 181 Long hole for hinge 181a Long hole for upper hinge 181b Long hole for lower hinge 200 2 holding member 210 second substrate 220 second upper and lower side plates 220a second upper side plate 220b second lower side plate 230 second holding recess 230a second upper holding recess 230b second lower holding recess 240 long hole 250 protruding piece 250a Upper projection piece 250b Lower projection piece 270 Second grip portion 300 Pressing nut 310 Clamping nut 320 Clamping nut 330 Washer A Suspension bolt B Suspension bolt C Steel material C1 Through hole D Piping E U bolt

Claims (3)

A steel material mounting bracket for hanging bolts for fixing and attaching a steel material for mounting a pipe on a hanging bolt suspended from a floor slab or the like to a pair of holding members that hold the hanging bolt from the outer side in the circumferential direction, wherein the pair of holding members are Both thin steel plates are bent to form a substantially U-shape consisting of a base plate and upper and lower side plates, and the upper and lower side plates are formed with clamping recesses for contacting and clamping one side of the suspension bolt. a first clamping member is formed by fixing a first bolt shaft to one substrate, and a second clamping member is formed by providing a through hole through which the first bolt shaft of the first clamping member is inserted in the other substrate; The first bolt shaft of the first clamping member is inserted into the through hole of the second clamping member, and a pressing nut is screwed onto the first bolt shaft of the first clamping member from the outside thereof so as to advance and retract. The first clamping member and the second clamping member are screwed together via the first bolt shaft of the first clamping member such that the first clamping member and the second clamping member on the clamping concave side are separated from each other. and the other end side of the holding bolt is inserted into the gap between the first holding member and the second holding member, and the holding recess of the first holding member and the holding recess of the second holding member A steel fitting for a suspension bolt, wherein the suspension bolt can be clamped between and. A second bolt shaft projecting in a direction opposite to the projecting direction of the first bolt shaft is fixed to the base plate of the first clamping member , and a tightening nut is provided which can be advanced and retracted by being screwed onto the second bolt shaft. 2. The steel fitting for hanging bolts according to claim 1, characterized in that: By connecting the upper plates of the first holding member and the second holding member and the lower plates of the first holding member and the second holding member with a hinge portion, the hinge portion is used as a pivot. 3. The steel fitting for a hanger bolt according to claim 1, wherein said first clamping member and said second clamping member can be freely opened and closed in a direction of clamping or not clamping said clamping bolt.

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