JP2579591Y2 - Hanging bolt mounting structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension bolt mounting structure for suspending and supporting ceiling equipment.

[0002]

2. Description of the Related Art Under a floor slab constructed using a driving form for a floor slab such as a deck plate or a keystone plate, ceiling equipment (for example, an air-conditioning duct installed on a ceiling base or a ceiling space, Conventionally, a structure as shown in FIG. 3 has been adopted for attaching a suspension bolt for suspending and supporting a smoke exhaust duct hot water supply pipe, a water supply pipe, a conduit, and the like.

In FIG. 3 , reference numeral 1 denotes a driving form for a floor slab such as a deck plate or a keystone plate, 2 denotes a suspension bolt, and 3 denotes an insert hardware. The upper end of the suspension bolt 2 is screwed into a central portion. A screw hole 3a is formed, and a large diameter flange 3b is formed at the upper end. Reference numeral 4 denotes a synthetic resin sleeve fitted to the lower end of the insert hardware 3.
A plurality of retaining elastic pieces 4a are provided on the outer peripheral surface at appropriate intervals in the circumferential direction. Reference numeral 5 denotes a coil spring fitted around the outer periphery of the metal insert 3 in a compressed state between the large-diameter flange portion 3b and the driving formwork 1 for floor slab.

The coil spring 5 urges the insert metal member 3 upward while the sleeve 4 fitted to the lower end of the insert metal member 3 is inserted from above into a through hole 1a formed in the driving frame 1 for floor slab. By doing so, the upper end of the retaining elastic piece 4a abuts against the lower surface of the floor slab driving form 1 so that the insert hardware 3 is maintained in a fixed mounting posture with respect to the floor slab driving form 1. Has become. Numeral 6 denotes a washer and numeral 7 denotes concrete cast on the floor slab driving form 1. The concrete 7 and the floor slab driving form 1 constitute a composite floor slab.

[0005]

[Problems to be solved by the invention] In the above conventional structure,
When a downward load is applied to the insert hardware 3 before the concrete 7 is cast, the coil spring 5 contracts, the insert hardware 2 moves downward, and the embedding depth of the insert hardware 2 in the concrete 7 decreases. become.

For this reason, it is possible to apply a load to the suspension bolts 2 until a predetermined strength is developed in the concrete 7 cast on the driving formwork 1 for the floor slab and the insert hardware 2 is firmly fixed. It is not possible to suspend and support the ceiling equipment on the lower floor, so it is necessary to perform the work on the ceiling equipment on the lower floor after the concrete on the upper floor is hardened, and there is a disadvantage that the construction period becomes longer. .

[0007] In view of the above-mentioned conventional disadvantages, the present invention is directed to a suspension bolt which can shorten the construction period by constructing ceiling equipment on the lower floor before casting concrete for floor slab on the upper floor. It is intended to provide a mounting structure.

[0008]

The technical means taken by the present invention to achieve the above object are as follows. That is, the mounting structure of the suspension bolt according to the present invention is a floor slab.
The lower end of the insert hardware in the through hole formed in the
The synthetic resin sleeve fitted to the part
The upper end of the formed retaining elastic piece is below the driving form for the floor slab.
Insert in a state facing the surface, around the outer periphery of the insert hardware,
A coil spring that urges the insert hardware upward;
Insert hardware is brought into contact with the large diameter flange of the insert hardware.
With a steel sleeve that prevents the
Fit the hanging bolts of the ceiling equipment into the screw holes of the insert hardware.
The upper end of the screw is screwed in.
You.

[0009]

According to the above arrangement, the load applied to the suspension bolt
As a result, the insert bracket is raised by the coil spring
When it is lowered to some extent against the bias, the insert
The large-diameter flange of the metal fitting contacts the upper edge of the steel sleeve,
The above descent is prevented. Therefore, for concrete
The necessary embedding depth of the insert metal fitting is secured, and
The load is supported by a driving form for the floor slab.
become.

[0010]

1 and 2 show a hanging bolt mounting structure according to the present invention. In this mounting structure, a synthetic resin sleeve 4 fitted into the through hole 1a of the floor slab driving form 1 at the lower end of the insert hardware 3 is attached to the floor slab. Insert from above into a state facing the lower surface of the driving formwork 1
A coil spring 5 that urges the insert hardware 3 upward and a steel sleeve 10 that prevents the insert hardware 3 from lowering by a certain amount due to contact with the large-diameter flange portion 3b of the insert hardware 3 are provided around the outer periphery of the insert. The upper end side screw portion of the suspension bolt 2 of the ceiling equipment is screwed into the screw hole 3a of the insert metal fitting 3.

[0011] Incidentally, hanger rod 2, prior to insertion of the synthetic resin sleeve 4 with respect to the through-hole 1a, 1 preliminarily by threaded connection to the screw hole 3a of the insert fittings 3, by working from the mold above Will be installed in the state shown in FIG. As described with reference to FIG. 3 , a plurality of retaining elastic pieces 4a are provided on the outer periphery of the synthetic resin sleeve 4 at appropriate circumferential intervals. Then, the insert metal member 3 is pushed down, and the synthetic resin sleeve 4 is inserted into the through hole 1a.
Is inserted until the upper end of the retaining elastic piece 4a passes through the through hole 1a, so that the retaining elastic piece 4a is expanded and deformed by the elastic restoring force. Accordingly, as shown in FIG. 1 , the coil spring 5 urges the insert metal member 3 upward to urge the insert elastic piece 4.
The upper end of a is in contact with the lower surface of the floor slab driving form 1, and the insert hardware 3 is maintained in a fixed mounting posture with respect to the floor slab driving form 1.

[0012] According to the above configuration, the load on the hanger rod 2, the insert fitting 3 is the coil spring 5
2 , the large-diameter flange portion 3b of the insert fitting 3 comes into contact with the upper edge of the steel sleeve 10 to prevent further lowering, as shown in FIG. As a result, the necessary embedding depth of the insert 3 in the concrete 7 is ensured, and the load is supported by the floor slab driving form 1 via the steel sleeve 10.

[0013]

Ri has been described above through, according to the invention] According to the present invention, the descending insert hardware is constant or blocked by a steel sleeve by a load applied to the hanger rod, embedding depth of the insert fittings for concrete is ensured Therefore, it is possible to suspend and support the ceiling equipment on the lower floor with suspension bolts before the concrete for the floor slab on the upper floor is cast, and the construction period can be shortened by preceding the construction of the ceiling equipment. It is.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a mounting structure of a suspension bolt according to the present invention.

FIG. 2 A state where the load of ceiling equipment is applied to the suspension bolt
FIG.

FIG. 3 is a sectional view showing a conventional hanging bolt mounting structure.
is there.

[Description of Signs] 1 ... Driving formwork for floor slab, 1a ... Through hole, 2 ... Hanging bolt, 3 ... Insert hardware, 3a ... Screw hole, 3b ... Large diameter flange, 4 ... Synthetic resin sleeve, 4a ... Retaining elastic piece, 5: coil spring, 7: concrete , 10 : steel sleeve.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04B 1/41 502

Claims (1)

(57) [Scope of request for utility model registration] 1. A through hole formed in a driving form for a floor slab.
Three synthetic resin fittings on the lower end of the insert hardware
The upper end of the retaining elastic piece formed on the sleeve
Insert the slab in such a way that it faces the lower surface of the
The insert hardware is urged upward on the outer periphery of the insert hardware.
Contact between the coil spring and the large diameter flange of the insert hardware
Prevents the insert metal from falling below a certain level due to contact
With a steel sleeve to be inserted and the screw holes in the insert hardware
Screw the upper end of the hanging bolt of the ceiling equipment into the
A mounting structure for hanging bolts.