JPH0543016B2 - - Google Patents

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.

[Conventional technology]

The deck plate functions as a formwork when pouring concrete, and is used by being attached to the ceiling of a factory or the like without being removed.

When attempting to bury deck plate inserts (hereinafter simply referred to as "inserts") in concrete in order to suspend various appliances from the ceiling surface made of this deck plate, it is necessary to bury the deck plate inserts (hereinafter simply referred to as "inserts") in the deck plate itself, like wooden formwork. It is difficult to secure the insert to the deck plate because the insert cannot be nailed into place.

Conventional inserts fixed to such deck plates are shown in Figures 14 to 1.
The one shown in Figure 6 is known.

This insert consists of an insert main body 21 having a female thread 21a formed on the inner circumferential surface of a cylindrical body whose upper end is closed, a resin cap 22 that is fitted around the lower half of the insert main body 21, and an insert. It is composed of a washer 23 that is slidably fitted on the outside of the main body 21, and a compression spring 24 that is elastically mounted between the washer 23 and the head 21b of the insert main body 21.

As shown in FIG. 14, the upper end of the cap 22 is divided into a plurality of pieces along the circumferential direction to form an elastically deformable tongue piece 22a.

To fix an insert with such a configuration to the deck plate 25, first use a drill to drill a pilot hole 26 in the deck plate 25, and then insert the pilot hole 26 into the deck plate 25 using a drill.
When the entire insert is pushed in, the upper end of the cap 22 contracts in diameter due to the elastic deformation of the tongue piece 22a, and when the cap 22 completely passes through the lower hole 26, the tongue piece 22a of the cap 22 returns to its original shape. By the elastic restoring force of the compression spring 24,
A deck plate 25 is sandwiched between the upper end surface of the cap 22 and the washer 23, and the insert is fixed to the deck plate 25.

In this way, conventional inserts are composed of a large number of parts, resulting in a complex structure and increased cost.In addition, they have a structure in which the deck plate is held in place by sandwiching it from above and below using the elastic restoring force of a compression spring. Therefore, when an external force is applied to the insert, there is a problem that it easily comes off.

[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 to solve the problem]

In the insert according to the present invention, a tapered cylindrical part is integrally molded at the lower end of a cylindrical main body having a through hole in the center, and the outer diameter of the tapered cylindrical part gradually decreases toward the bottom. A male thread is formed on the outer peripheral surface of the main body part, and an annular cutting blade for drilling a hole is formed on the lower end surface of the main body part, and a drill is inserted into the main body part and the through hole provided in the main body part. The main body is provided with a rotation stopper for rotating the two together.

[Action of the invention]

To fix the insert according to the present invention to the deck plate, insert a drill into the through hole provided in the main body, and when the drill is rotated in this state, a guide hole will be drilled in the deck plate, and the insert will be inserted into the deck plate during rotation. When the drill passes through the deck plate, the drill is lowered relative to the deck plate.

By the engagement between the engaging part provided on the drill and the rotation stopper provided on the main body of the insert,
Engages with the drill insert. Therefore, the insert rotates together with the drill, and the outer periphery of the guide hole is cut into an annular shape by the annular cutting blade formed on the lower end surface of the tapered cylindrical part, which is used to fix the insert. A pilot hole is formed. Immediately after the pilot hole for fixing the insert is formed, the tip of the tapered cylindrical portion of the insert is pushed into the pilot hole, and the male thread formed on the outer circumferential surface of this tapered cylindrical portion is inserted by itself. The insert is fixed to the deck plate by screwing it into the prepared hole while tapping the screw.

In this way, the insert can be fixed to the deck plate at the same time when the pilot hole for fixing the insert is drilled in the deck plate using a drill, so that workability for fixing the insert can be improved.

Further, since the insert is fixed to the deck plate by screwing, the fixing strength is increased.

〔Example〕

An insert according to the invention is shown in FIGS. 1-4.

Insert A has a one-piece structure, and includes a cylindrical main body part 2 with a through hole 1 provided in the center, and a collar part 3 integrally provided at the upper end of this main body part 2.
and a tapered cylindrical portion 4 integrally molded on the lower end portion of the main body portion 2.

This tapered cylindrical portion 4 is tapered so that the outer diameter gradually decreases toward the bottom.
Its maximum outer diameter is smaller than the outer diameter of the main body portion 2.
Further, an annular cutting blade 5 is formed on the lower end surface of the tapered cylindrical portion 4, and a male thread 6 is formed on the outer circumferential surface thereof to be connected to the annular cutting blade 5.

A step portion is provided at the connection portion between the main body portion 2 and the tapered cylindrical portion 4, and a contact end surface 7 that abuts against the deck plate P is provided in this step portion.

The cylindrical main body part 2 and the tapered cylindrical part 4, which has a male thread 6 formed on its outer peripheral surface, are concentric. A female thread 8 is provided on the inner peripheral surface of the through hole 1 of the main body 2.
The 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 portion of the through-hole 1 provided in the main body portion 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 the inserts A are secured to the deck plate P is shown in FIGS. 5 to 8.

First, insert the drill D into the through hole 1 provided in the main body 2, and insert the insert A into the deck plate P.
When the drill D is rotated in this state,
The insert A remains placed on the deck plate P and does not rotate, and only the drill D rotates, and a guide hole 11 of a size corresponding to the diameter of this drill D is drilled in the deck plate P (fifth figure).

When the rotating drill D passes through the deck plate P, the drill D rapidly descends relative to the deck plate P, and the nut-shaped engaging portion 12 fixed to the upper end of the drill D engages the insert A. The drill D and the insert A are fitted into the hexagonal hole 9 provided in the main body 2, and the insert A begins to rotate together with the drill D (see Fig. 6). ).

When the drill D is pressed downward while the insert A is rotating together with the drill D, the annular cutting blade 5 formed on the lower end surface of the tapered cylindrical portion 4 of the insert A cuts into the deck plate. In order to be pressed against P and rotate around the guide hole 11, the outer periphery of the guide hole 11 is cut into an annular shape to form a pilot hole 1 for fixing the insert.
3 can be opened (Figure 7). The inner diameter of this pilot hole 13 is large enough to allow the lower end of the tapered cylindrical portion 4 to be exposed thereto.

Immediately after the annular cutting blade 5 drills the pilot hole 13 for fixing the insert, the male thread 6 formed on the outer peripheral surface of the tapered cylindrical portion 4 is pushed into the pilot hole 13. is screwed into the prepared hole 13 while tapping itself by the rotation of the insert A, thereby fixing the insert A to the deck plate P. (Figure 8).

Then, as shown in FIG. 9, when the hexagonal hole 9 provided in the main body part 2 is covered with a lid 14 and concrete C is poured, the insert A is buried in this 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 connect the male screw 15a of the hanging rod 15 with the inner periphery of the through hole 1 of the main body 2 of the insert A. The internal screws 8 formed on the surface are screwed together, thereby suspending various instruments from the ceiling surface via the hanging rods 15.

Further, as shown in insert A' shown in FIG. 10, if a groove 16 is provided along the axial direction of the tapered cylindrical part 4 in the part of the male thread 6 formed on the outer peripheral surface of the tapered cylindrical part 4. Since the thread of the male screw 6 is divided along the helical line direction, it becomes easier to screw the male screw 6 into the prepared hole 13 of the deck plate P.

In addition, as shown in FIGS. 11 to 13, the engaging portion 12 provided integrally with the drill D,
If the ball plunger 19 to which the ball 18 at one end of the compression spring 17 is integrally attached is installed inside the drill D along the radial direction,
When the engaging part 12 of the drill D is inserted into the hexagonal hole 9 provided in the collar part 3 of the main body part 2 of the insert A, the ball 18 is
comes into elastic contact with the inner wall surface of the hexagonal hole 9, and as a result, the 11th
As shown in the figure, the drill D can be rotated while the insert A is held in the drill D.

Therefore, the work of drilling the guide hole 11 with the drill D and the work of drilling the pilot hole 13 with the annular cutting blade 5 can be performed as a series.

In the above embodiment, a hexagonal hole 9 is provided at the upper end of the main body 2 of the insert A, and the nut-shaped engaging portion 12 fixed to the drill D is fitted into the hexagonal hole 9. Drill D
This prevents rotation of the ring, but various structures for stopping this rotation are conceivable. For example, rotation of the drill D relative to the insert A is prevented by engagement between a pin installed along the radial direction on the upper end of the drill D and a groove provided on the upper end surface of the main body 2 of the insert A. It can be prevented.

〔Effect of the invention〕

According to the insert according to the present invention, the external thread on the outer circumferential surface of the tapered cylindrical portion constituting the insert is screwed into the inner circumferential portion of the pilot hole drilled in the deck plate by the rotation of the integrally structured insert itself. By this, the insert is fixed to the deck plate, so the fixing strength of the insert to the deck plate is increased.

Further, according to the method for fixing an insert according to the present invention, a pilot hole for fixing the insert is formed by the annular cutting blade formed on the lower end surface of the tapered cylindrical portion constituting the insert, and the pilot hole is formed. Immediately after this, the male thread formed on the outer circumferential surface of the tapered cylindrical part is screwed into the prepared hole while tapping, so when drilling the prepared hole for fixing the insert in the deck plate, the insert is inserted into the deck plate at the same time. The workability for fixing inserts is significantly improved.

In summary, according to the present invention, a tapered cylindrical portion is integrally molded at the lower end of the main body, an annular cutting edge is formed on the lower end surface of the tapered cylindrical portion, and a male thread is formed on the outer peripheral surface of the tapered cylindrical portion. With the integrated insert, it becomes possible to easily fix the insert to the deck plate, which has been considered troublesome in the past, and to securely do so with great fixing strength.

[Brief explanation of the drawing]

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, FIG. 3 is a plan view, FIG. 4 is a front sectional view, and FIGS. 5 to 8 are
A cross-sectional view for explaining the order in which the inserts A are fixed to the deck plate P, FIG. 9 is a cross-sectional view of the hanging rod 15 screwed into the insert A fixed to the deck plate P, and FIG. 11 is a front view of the insert A' in which the groove 16 is provided in the male thread 6 of the tapered cylindrical portion 4, and FIG. 12 is a front cross-sectional view of the insert A held by the drill D. 13 is an enlarged view of the ball 18 in FIG. 11. 14 to 16 are diagrams for explaining the conventional technology, and FIG. 14 shows the cap 2 constituting the conventional insert.
15 is a sectional view of a conventional insert, and FIG. 16 is a sectional view of the insert attached to the deck plate 25. The explanations of the symbols of the main parts constituting the present invention are as follows. A, A': insert, D: drill, P: deck plate, 1: through hole, 2: main body, 4: tapered cylindrical section, 5: annular cutting blade, 6: male thread, 9:
Hexagonal hole (rotation stopper), 11: Guide hole, 13: Pilot hole.

Claims (1)

[Claims] 1. A tapered cylindrical portion is integrally molded at the lower end of a cylindrical main body with a through hole in the center, and the tapered cylindrical portion has an outer diameter that gradually decreases toward the bottom. a male thread is formed on the outer peripheral surface thereof, and an annular cutting blade for making a hole is formed on the lower end surface of the main body;
A rotation stopper provided on this for rotating together with the drill inserted into the through hole,
An insert for a deck plate, characterized in that it is provided in the main body. 2. A tapered cylindrical part is integrally molded on the lower end of the main body having a through hole in the center, and a male thread is formed on the outer peripheral surface of the tapered cylindrical part, and an annular cutting blade is formed on the lower end surface of the tapered cylindrical part. A method for fixing an insert for a deck plate to a deck plate, which comprises: drilling a guide hole in the deck plate with a drill inserted into the through hole of the main body, and then rotating the insert integrally with the drill. , a pilot hole is made in the deck plate by an annular cutting blade formed on the lower end surface of the tapered cylindrical portion, and a male thread on the outer peripheral surface of the tapered cylindrical portion is screwed into the pilot hole by subsequent rotation of the insert, A method for fixing an insert for a deck plate, characterized by fixing the insert to the deck plate.