JPH0586678A - Hanger metal fixture in deck-plate floor - Google Patents

Abstract

PURPOSE:To mount a hanger metal fixture suspending a ceiling, service pipes, etc., under a floor slab firmly. CONSTITUTION:Arms 15 are respectively mounted inward on both sides of a metal fixture body 12 of a hanger metal fixture 11 so that they are capable of turning. The arms 15 have hook sections 15a on the upper ends of them. The arms 15 are energized inward with torsion springs 14. A hole 12e is bored in the bottom plate 12a of the metal fixture body 12, and a nut 13 is fixed thereto. A hanger bolt 18 is screwed to the nut 13. When the hanger metal fixture 11 is mounted on the bottom of a floor slab, in the case the hanger metal fixture is pushed up from a downward position of the bottom of the floor slab, the hook sections 15a on the upper ends of the arms 15 are so contacted that they hold right and left inclined web surfaces on a deck-plate of the bottom of the floor slab between them and are slid to interlock with channels form in the inclined web surfaces. When the hanger bolt is screwed in until the bottom of the deck-plate is strongly pushed up, the hook sections 15a of the arms 15 are strongly cut into the channels, and the hanger metal fixture 11 is firmly fixed to the bottom of the floor slab.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where concrete is placed on a deck plate to form a floor slab,
The present invention relates to a hanging metal fitting to be attached to the lower surface of a floor slab to support a ceiling, equipment piping, ducts, etc. provided in the space below this floor slab (deck plate floor).

[0002]

2. Description of the Related Art When installing pipes, ducts, etc. in the lower space of a floor slab formed by placing concrete on a deck plate as described above, a drill is used at a predetermined position on the deck plate before placing concrete. A method is generally adopted in which a hole is opened, an insert is attached to the hole, and after the placed concrete is hardened, a suspension bolt is screwed into the insert and a pipe, a duct, etc. are attached to the suspension bolt.

Further, as shown in FIG. 7, for example, a mountain portion 1a
1 formed by bending the inclined web surfaces 1b on both sides of the
In the case of the floor slab 10 formed by using the deck plate 1 having c and having a dovetail-shaped recess (concave viewed from the lower surface side) 1e in the center of the valley 1d, as shown in FIG. The method of fitting the hanging metal fitting 2 into the dovetail-shaped recess 1e is adopted (see Japanese Utility Model Laid-Open No. 63-138038). The hanging metal fitting 2 has hook-shaped locking portions 5 on the upper ends of the left and right side portions 4 of the locking metal fitting 3, a nut 6 is fixed to the lower surface portion, and a hanging bolt 7 is screwed onto the nut 6. It is a structure. In this suspension fitting 2, when the suspension bolt 7 descends and is not in contact with the left and right side portions 4 and 4, the space between the left and right side portions 4 and 4 is closed, and therefore the hook-shaped locking portion at the upper end. The interval between 5 and 5 is also narrowly closed, and the hook-shaped locking portion 5 of the locking metal fitting 3 can be inserted into the dovetail-shaped recess 1e from below. Then, when the suspension bolt 7 screwed to the nut 6 is turned up and pushed up, the left and right side portions 4, 4 are spread left and right by the suspension bolt 7, and the hook-shaped locking portions 5, 5 at the upper and left sides are left and right. And is fitted into the blind portion of the dovetail recess 1e as shown in the drawing. As a result, the hanging metal fitting 2 is attached to the lower surface of the floor slab 10.

[0004]

In the above-mentioned method of drilling holes in the deck plate and attaching the inserts in advance, it is necessary that the positions of the pipes and ducts are determined before the concrete is placed. However, the equipment plan is often undecided or changed at a later date, and it is necessary to install suspension bolts at positions without inserts after the floor slab is completed. In such a case, it is necessary to re-drill a hole and attach a hole-in anchor, and then attach a suspension bolt to this, but the work of attaching the suspension bolt after completion of the floor slab is complicated, and the construction cost is extremely high.

On the other hand, in the method of fitting the hook-shaped locking portion 5 of the locking metal fitting 3 into the dovetail-shaped concave portion 1e of the deck plate 1 shown in FIG. 8, it can be mounted at an arbitrary position after the floor slab is completed. Also, because the installation work is easy, it is excellent in terms of workability and cost when supporting a relatively lightweight ceiling, etc., but is insufficient in strength to support heavy objects such as equipment pipes and ducts. There is a problem of doing.

The present invention has been made in view of the above circumstances, and provides a hanging metal fitting that can be attached to any place after the floor slab is completed and can be used for supporting heavy objects such as equipment piping and ducts. The purpose is to do.

[0007]

DISCLOSURE OF THE INVENTION The present invention for solving the above-mentioned problems is a hanging metal fitting to be attached to the lower surface of a deck plate floor, and a metal fitting main body having a screw hole portion in the center and both sides of the metal fitting main body. A pair of arms rotatably mounted in opposite directions and having inward hooks at the upper end, elastic members for biasing the pair of arms inwardly, and a screw hole portion of the metal fitting body And a suspension bolt that is screwed into the.

[0008]

In the above structure, when the hanging metal fitting is pushed up from the lower position of the valley portion of the deck plate, the hooks at the upper ends of the left and right arms come into contact with each other so as to sandwich the left and right inclined web surfaces of the deck plate while sliding. When it rises and reaches the groove formed on the inclined web surface, the hook at the upper end of each arm engages with the groove by the inward elastic force of the elastic member. After that, when the suspension bolt screwed into the screw hole is turned to raise the suspension bolt, the upper end of the suspension bolt hits the lower surface of the deck plate. When the lower surface of the deck plate is pushed up by further screwing the hanging bolt, the hooks at the upper ends of the left and right arms are strongly engaged by the pushing force of the hanging bolt so as to further bite into the groove of the inclined web surface. In this way, the hanging bracket is firmly attached to the deck plate floor.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The hanging metal fitting of the embodiment is the same as that shown in FIG.
It is a hanging metal fitting attached to the lower surface of the floor slab 10. That is, the deck plate 1 has a groove portion 1c formed by bending on the inclined web surfaces 1b on both sides of the mountain portion 1a, and has a dovetail-like recessed portion (recessed when viewed from the lower surface side) 1e in the center of the valley portion 1d. The floor slab 10 is a synthetic floor board formed by placing concrete on the deck plate 1. FIG. 1 is a front view of a hanging metal fitting 11 according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. 1. The metal fitting body 12 of the hanging metal fitting 11 includes a bottom plate 12a and a longitudinal direction (in FIG. 1). A box having inclined web surfaces 12b on both sides (lateral direction), width direction side plates 12c on both sides in the width direction (left and right direction in FIG. 2), and an upper plate 12d protruding inward from the upper end of each width direction side plate 12c. The bottom plate 1 with a striped structure
A hole 12e is formed in the center of 2a for passing a hanging bolt 18 that supports a ceiling, facility piping, ducts, etc.
A nut 13 for screwing the suspension bolt 18 is welded and fixed to the portion e. A pair of arms 15 are rotatably mounted in opposite directions via shafts 14 fixed to the side plates 12c in the vicinity of both ends of the metal fitting body 12 in the longitudinal direction, and hooks projecting inward from the upper ends of the arms 15, respectively. The portion 15a is formed. A torsion spring 16 is attached to the shaft 14 so as to hit the inclined web surface 12b of the metal fitting body 12 and a spring stopper 15b provided on the arm 15 to bias the arm 15 inwardly. The left and right arms 1 are provided on the upper plate 12d of the metal fitting body 12.
An arm stopper 17 is fixed to keep the interval between the hooks 15a at the upper end of 5 at a predetermined interval, that is, an interval slightly larger than the width dimension of the valley 1d of the deck plate 1 in cross section.

When the above-mentioned hanging metal fitting 11 is attached to the lower surface of the floor slab 10 shown in FIG. 7, it is carried out as follows.
When the hanging metal fitting 11 is pushed up from the position below the valley portion 1d of the deck plate 1, the hook portions 15a at both ends of the left and right arms 15 sandwich the left and right inclined web surfaces 1b of the deck plate 1 as shown in FIG. To contact each other
Slides upward while opening outward, and the hook 1
When 5a reaches the groove portion 1c formed on the inclined web surface 1b, the repulsive force of the torsion spring 16 causes the groove portion 1c to move toward the groove portion 1c.
Engage as shown in. As a result, the hanging metal fitting 11 is temporarily attached to the deck plate 1. Subsequently, when the hanging bolt 18 is turned to raise the hanging bolt 18, the upper end of the hanging bolt 18 comes into contact with the lower surface of the deck plate 1 (the dovetail-shaped recess 1e in the illustrated example) as shown in FIG. .. When the lower surface of the deck plate 1 is pushed up further by screwing the hanging bolt 18 more strongly, the hook portions 15a at the upper ends of the left and right arms 15 further bite into the groove portion 1c as a reaction force against the pushing force of the hanging bolt 18. In this way, the hanging metal fitting 11 is firmly attached to the floor slab 10.

When heavy objects such as equipment pipes and ducts are attached to the suspension bolts 18 of the suspension fitting 11 fixed to the lower surface of the floor slab 10 as described above, the degree of fixation of the suspension fitting 11 to the floor slab 10 is Become stronger. That is, when the load P is applied to the hanging bolt 18 in the use state,
As shown in FIG. 6, a tensile axial force N and a bending moment for supporting half of the load act on the arm 15 on one side,
This tensile axial force N is decomposed into a horizontal component stress H and a downward vertical component stress V. Of these, the horizontal component stress H is
Since the inclined web surface 1b direction, that is, the hook portion 15a works in the direction to bite into the groove 1c, the force of the hook portion 15a to bite into the groove portion 1c increases as the load P increases, and therefore is applied to the hanging bolt 18 as described above. The larger the load P, the stronger the degree of fixing of the hanging metal fitting 11 to the floor slab 10 and the sufficiently high safety is secured.

In the embodiment, the nut 13 is fixed to the bottom plate 12a of the metal fitting body 12 by welding as a screw hole provided in the metal fitting body 12, but the invention is not limited to this. For example, a female screw may be formed in the burr portion of the hole formed in the bottom plate 12a so as to form a burr on the periphery to form a screw hole portion.

Although the torsion spring 16 is used as the elastic member for urging the arm 15 inward in the embodiment, the invention is not limited to this, and a leaf spring or rubber may be used.

In the embodiment, the arm stopper 17 is provided on the upper surface of the metal fitting body 12 so that the arm 15 does not fall inward.
Although the elastic member such as the torsion spring 16 is provided in the arm 1,
The arm stopper 17 is not necessarily provided if the force for returning the 5 to only a vertical position is exerted.

Further, the shape of the metal fitting body is not limited to that of the embodiment, but various shapes can be considered. For example, the metal fitting body 12
The side plates 12c on both sides in the width direction and the side plates 12b inclined in the front-rear direction are for ensuring sufficient strength of the metal fitting body 12 when suspending heavy objects such as equipment piping and for mounting the shaft 14 of the arm 15. Therefore, if these functions can be realized by other means, these side plates 12c,
It is not necessary to provide 12b. In short, the metal fitting body 12
Is required to have a predetermined strength, have a screw hole portion such as the nut 13 in the center, and can rotatably attach the arms 15 to both ends.

Further, the sectional shape of the deck plate is not limited to that of the embodiment. In short, the arm 15
Any groove may be formed so that the hook portion 15a at the upper end of can be engaged.

[0017]

According to the present invention, there is provided a metal fitting body having a screw hole portion in the center, and an inward hook portion attached to both sides of the metal fitting body so as to be rotatable in opposite directions. Since the pair of arms, the elastic members for urging the pair of arms inwardly, and the suspension bolts screwed into the screw holes of the metal fitting body are provided, the left and right slopes of the valley are inclined. When the hanging metal fitting of the present invention is attached to a floor slab using a deck plate having a cross section having a groove portion on the web surface, it can be attached so as to engage with the groove portion of the deck plate. Therefore, it is possible to secure sufficient strength for the mounting part on the floor slab side, and it is also easy to increase the strength of the hanging metal fittings, making it possible to use it for supporting heavy objects such as equipment pipes and ducts. And since this hanging metal fitting can be attached to an arbitrary place after the floor slab is completed, the workability is good.

[Brief description of drawings]

FIG. 1 is a front view of a partially cutaway metal fitting showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a view for explaining a procedure for attaching the above-mentioned hanging fitting to the lower surface of the floor slab, and is a view showing a state in the middle of attachment.

FIG. 4 is a view for explaining how to similarly attach the hanging metal fittings to the lower surface of the floor slab, in a state in which the arm is engaged with the groove portion of the deck plate.

FIG. 5 is a view for explaining how to similarly attach the hanging metal fittings to the lower surface of the floor slab, and is a view showing a completed attachment state.

FIG. 6 is a force balance diagram when a load is applied to the suspension bolt of the suspension fitting.

FIG. 7 is a cross-sectional view of a floor slab to which the hanging metal fitting of one embodiment of the present invention is attached.

FIG. 8 is a front view of a conventional hanging fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deck plate 1a Mountain part 1b Inclined web surface 1c Groove part 1d Valley part 11 Hanging metal fitting 12 Metal fitting body 13 Nut (screw hole part) 14 Shaft 15 Arm 15a Hook part 16 Torsional spring (elastic member) 18 Hanging bolt

Claims (1)

[Claims] 1. A hanging metal fitting to be attached to a lower surface of a deck plate floor, which comprises a metal fitting main body having a screw hole portion in the center, and an upper end attached to both sides of the metal fitting main body so as to be rotatable in opposite directions. A pair of arms having inward hooks, elastic members for biasing the pair of arms inward, and a suspension bolt screwed into a screw hole of the metal fitting body. Suspended metal fittings on the deck plate floor.