JPH02236331A - Insert for steel deck and fixing method thereof - Google Patents

Abstract

PURPOSE:To enhance the workability for fixing an insert to a steel deck by providing ring-shaped saw teeth and a tapered external thread on the lower end surface of the insert body having a through hole, and by integrally rotating the insert body and a drill. CONSTITUTION:When a drill is inserted into the through hole 1 of an insert body 2 and is turned, the drill D is lowered while piercing through a steel deck P, and the insert body 2 whose whirl-stop 9 of a hexagonal hole has been fitted in the nut-shaped engaging part 12 of the drill D is turned integrally with the drill. In this case, the prepared hole 13 for fixing the insert is formed by the saw-teeth 5 on the lower end surface of the insert body 2, and at the same time, the tapered external thread 6 formed on the outer circumferential surface forms a thread on the prepared hole 13 while being screwed in, and the insert A is fixed to the steel deck P. Thus, the workability for fixing the insert can be significantly enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a deck plate insert that is used while being fixed to a deck plate, and a method for fixing the same. [Prior art] Deck plates function as formwork when pouring concrete, and are used by being attached to the ceiling of factories, etc., without being removed. When attempting to bury a deck bullet insert (hereinafter simply referred to as an insert) in concrete in order to suspend various equipment on a ceiling surface made of this deck plate, the insert must be nailed to the deck plate itself like a wooden formwork. It is difficult to fix the insert to the deck plate because it cannot be fixed in place. As conventional inserts used while being fixed to such deck plates, those shown in FIGS. 14 to 16 are known.

This insert consists of an insert main body 21 in which a female thread 21a is formed on the inner circumferential surface of a cylindrical body whose upper end is closed, a resin camp 22 that is externally fitted to approximately the lower half of this insert main body 21, and an insert main body 21. A washer 23 that is slidably fitted onto the outside of the main body 21, and this washer 2.
3 and a compression spring 24 loaded between the head 2lb of the insert body 21. As shown in FIG. 14, the upper end of the camp 22 is
The tongue piece 22a is divided into a plurality of pieces along the circumferential direction and is elastically deformable.

To fix an insert with such a configuration to the deck plate 25, first use a drill to drill the deck plate 25.
When a pilot hole 26 is made in the pilot hole 26 and the entire insert is pushed into the pilot hole 26, the upper end of the camp 22 is reduced in diameter by the elastic deformation of the tongue piece 22a, and when the cap 22 completely passes through the pilot hole 26, the cap The tongue piece 22a of 22 is restored to its original shape, and the deck plate 25 is sandwiched between the upper end surface of the camp 22 and the waffle 23 by the elastic restoring force of the compression spring 24, and the insert is inserted into the deck plate 25. Fixed. In this way, conventional inserts are composed of many parts, so it is difficult to make horizontal inserts. In addition to being cumbersome and expensive, the insert has a structure in which the deck plate is sandwiched and fixed from above and below by the elastic restoring force of the compression spring, so there is a problem that it easily comes off when external force is applied to the insert.

[Problem to be solved by the invention]

The present invention simplifies the structure of the insert to increase the strength of fixing it to the deck plate, and also makes it possible to fix the insert to the deck plate at the same time when drilling a pilot hole for fixing the insert in the deck plate using a drill. The objective was to improve the workability of fixing the insert. [Means for Solving the Problems] The insert according to the present invention has a cylindrical insert body provided with a through hole in the center, and an annular saw blade is formed on the lower end surface of the insert body. A tapered male thread is formed on the outer peripheral surface of the insert body, and the insert body and the drill inserted into the through hole of the insert body are rotated as one unit. [Operation of the invention] In order to fix the insert according to the present invention to the deck plate, a drill is inserted into the through hole provided in the insert body, and when the drill is rotated in this state, a guide hole is drilled in the deck plate. , when the rotating drill passes through the deck plate, the drill descends relative to the deck plate. The insert main body is engaged with the drill by the engagement between the engaging part provided on the drill and the rotation stopper provided on the insert main body. For this reason, the insert body rotates together with the drill, and the outer periphery of the guide hole is cut into an annular shape by an annular saw blade formed on the lower end surface of the insert body to create a pilot hole for fixing the insert. It is formed. Immediately after the prepared hole for fixing the insert is formed, the tapered male thread formed on the outer peripheral surface of the lower end of the insert body is pushed into this prepared hole.
This tapered male thread is tapped into the pilot hole by itself, and the insert is fixed to the deck plate. In this way, when drilling pilot holes for fixing the inserts in the deck plate, the inserts can be fixed to the deck plate at the same time, improving work efficiency for fixing the inserts. In addition, the insert is fixed to the deck plate using a screw-in structure, which increases the fixing strength. [Example] Figs. 1 to 4 show inserts according to the present invention. Insert A has a cylindrical insert main body 2 with a cylindrical insert body 2 provided with a through hole 1 in the center, and a collar portion at the upper end. 3, and a tapered cylindrical portion 4 having an outer diameter smaller than the outer diameter of the insert main body 2 is integrally provided at the lower end of the insert main body 2. On the lower end surface of this tapered cylindrical portion 4,
An annular saw blade 5 is formed, and a tapered male thread 6 is formed on the outer peripheral surface of the tapered cylindrical portion 4 so as to be connected to the annular saw blade 5. This tapered male screw 6 has a tapered shape in which the outer diameter gradually increases from the tip to the base. A stepped portion is provided at the connecting portion between the insert body 2 and the tapered cylindrical portion 4, and an abutting end surface 7 that contacts the deck plate P is provided in this stepped portion. Cylindrical insert body 2 and tapered male thread 6 on the outer peripheral surface
It is concentric with the tapered cylindrical part 4 in which is formed. A female thread 8 is formed on the inner peripheral surface of the through hole 1 of the insert body 2, and this female thread 8 is connected to the hollow portion 4a of the tapered cylindrical portion 4. Further, a hexagonal hole 9 is provided at the upper end of the through-hole 1 provided in the insert body 2, and the center of this hexagonal hole 9 coincides with the center of the through-hole 1. This insert A is fixed to the deck plate P at the same time when a drill D is used to drill a pilot hole for fixing the insert in the deck plate P.

The order in which inserts A are fixed to deck plate P is
This is shown in FIGS. 5-8.

First, insert the drill D into the through hole l provided in the insert body 2, and insert the insert body 2 into the deck plate P i3! When the drill D is rotated in this state,
The insert body 2 remains placed on the deck plate P and does not rotate; only the drill D rotates, and the insert body 2 remains placed on the deck plate P.
A guide hole 1l of a size corresponding to the diameter of this drill D is drilled (Fig. 5). When the rotating drill D penetrates the deck plate P, the drill D suddenly descends relative to the deck plate P, and the nut-shaped retaining part 12 fixed to the upper end of the drill D is inserted into the insert body. The insert body 2 is fitted into the hexagonal hole 9 provided in the drill D, and the insert body 2 becomes engaged with the drill D, and the insert body 2 begins to rotate together with the drill D (Fig. 6). ). When the drill D is pressed downward while the insert main body 2 is rotating together with the drill D, the annular saw blade 5 formed on the lower end surface of the tapered cylindrical portion 4 is pressed against the deck plate P. In order to be pressed and rotated around the guide hole 11, the outer periphery of the guide hole 1l is cut into an annular shape to form a pilot hole l3 for fixing the insert (FIG. 7). The inner diameter of the pilot hole 13 is such that the tapered male thread 6 formed on the outer peripheral surface of the tapered cylindrical portion 4 can be exposed thereto. Immediately after the pilot hole l3 for fixing the insert is drilled by the annular saw blade 5, the tapered male thread 6 formed on the outer peripheral surface of the tapered cylindrical portion 4 is pushed into the pilot hole 13, and this tapered male thread 6 is the insert body 2
As the insert rotates, the insert A is screwed into the prepared hole 13 while tapping itself, thereby fixing the insert A to the deck plate P (Fig. 8). Then, as shown in FIG.
When the concrete C is cast, the insert A is buried in the concrete C.

Insert the upper end of the hanging rod 15 into the hollow part 4a of the tapered cylindrical part 4 protruding from the lower surface of the deck plate P, and then hang the hanging rod l.
The male screw 15a of No. 5 is screwed together with the female screw 8 formed on the inner peripheral surface of the through hole 1 of the insert main body 2, thereby suspending various instruments from the ceiling surface via the hanging rod 15. In addition, like the insert A shown in Fig. 10,
If a groove portion l6 is provided along the axial direction of the tapered cylindrical portion 4 in the portion of the tapered male thread 6 formed on the outer circumferential surface of the tapered cylindrical portion 4, the thread of the taper-a screw 6 will form a helical line. Because it is divided along the direction, the deck plate P
This makes it easier to screw the tapered male screw 6 into the pilot hole 13. Further, as shown in FIGS. 11 to 13, a ball plunger 19 having a ball 18 integrally attached to one end of the compression spring l7 is attached to the retaining portion 12 integrally provided on the drill D. When the engaging part 12 of the drill D is inserted into the hexagonal hole 9 provided in the flange part 3 of the insert main body 2, the restoring force of the compression spring 17 causes the ball to be inserted in the radial direction of the drill D. 1B comes into elastic contact with the inner wall surface of the hexagonal hole 9, thereby making it possible to rotate the drill D while holding the insert body 2 in the drill D, as shown in FIG. Therefore, the work of drilling the guide hole 11 with the drill D,
The operation of drilling the pilot hole 13 using the annular saw blade 5 can be performed in a series. In addition, in the above example,
A hexagonal hole 9 is provided at the upper end of the insert body 2, and a drill D
By fitting the nut-shaped retaining portion 12 fixed to the hexagonal hole 9 into the hexagonal hole 9, the drill D
There are various possible structures for preventing rotation. For example, the drill D can be prevented from rotating relative to the insert body 2 by a bottle installed along the radial direction at the upper end of the drill D and a groove provided at the upper end surface of the insert body 2. [Effects of the Invention] According to the present invention, the pilot hole for fixing the insert is formed by the annular saw blade formed on the lower end surface of the insert main body,
Immediately after this pilot hole is formed, the tapered male screw formed on the outer peripheral surface of the lower end of the insert body is screwed into the pilot hole while tapping, so the pilot hole for fixing the insert is inserted into the deck plate. When opening the insert, the insert can be fixed to the deck plate at the same time, significantly improving the work efficiency for fixing the insert. In addition, the insert is fixed to the deck plate by screwing the tapered male thread into the inner circumference of the pilot hole drilled in the deck plate, which increases the fixing strength of the insert. As described above, according to the present invention, the simple structure of forming an annular saw blade on the lower end surface of the insert main body and forming a tapered male thread on the outer peripheral surface of the lower end of the insert main body eliminates problems that were conventionally considered troublesome. This makes it possible to easily and reliably fix the insert to the deck plate, which had previously been used, with great fixing strength.

[Brief explanation of drawings]

1 to 13 are diagrams for explaining the present invention, in which FIG. 1 is a perspective view of an insert A according to the present invention, FIG. 2 is a partially cutaway perspective view, 3 is a plan view, FIG. 4 is a front sectional view, FIGS. 5 to 8 are sectional views for explaining the order in which the insert A is fixed to the deck plate P, and FIG. The figure is a cross-sectional view of the hanging rod 15 screwed into the insert A fixed to the deck plate P, and Figure 10 is a sectional view of the tapered male thread 6.
11 is a front cross-sectional view of the insert body 2 held by the drill D, and FIG.
13 is an enlarged view of the ball 18 in FIG. 11. 14 to 16 are diagrams for explaining the conventional technology, in which FIG. 14 is a partially cutaway perspective view of a cap 22 constituting a conventional insert, and FIG. 15 is a partially cutaway perspective view. is a cross-sectional view of a conventional insert,
FIG. I6 is a sectional view of the insert attached to the deck plate 25. Explanations of the symbols of the main parts constituting the present invention are as follows. A. A': Insert P: Deck plate 2: Insert body 5: Annular saw blade 11: Guide hole D: Drill L: Through hole 4: Tapered cylindrical portion 6: Tapered male thread 13: Pilot hole Patent applicant Mirai Kogyo Stock Company Chart Figure 16

Claims (2)

[Claims] (1) An annular saw blade is formed on the lower end surface of the cylindrical insert body with a through hole in the center, and a tapered male thread is formed on the outer peripheral surface of the lower end of the insert body. An insert for a deck plate, characterized in that it rotates together with a drill inserted into a through hole of the insert body. (2) After drilling a guide hole in the deck plate with a drill inserted into the through hole of the insert body, the deck plate is cut using an annular saw blade formed on the lower end surface of the insert body, which rotates together with the drill. A deck plate characterized in that the insert is fixed to the deck plate by drilling a pilot hole in the deck plate and subsequently screwing a tapered male thread formed on the outer peripheral surface of the lower end of the insert body into the pilot hole by rotating the insert body. How to fix the insert.