JPH0519884B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a formwork apparatus for forming concrete products such as U-shaped grooves having lifting holes in both side walls for lifting and inversion.

[Prior art] Formwork equipment for forming concrete products, such as a U-shaped groove with lifting holes provided on both side walls, is generally known. The mold 1 is provided with a through hole 3 through which the lifting hole forming rod 2 is inserted into the mold frame, and the side frame 6 of the outer mold 1 around the through hole 3 is provided with the through hole 3.
A nut member 5 having a screw hole 4 in communication with the nut member 5 is fixed thereto.

To use this conventional formwork device, first assemble the inner mold 10 and the outer mold 1, and then connect the screw holes 4 of the nut members 5 fixed to the side frames 6, 6 of the outer mold 1 with the through holes 3 of the outer mold 1. Insert the lifting hole forming rod 2 into.

The lifting hole forming rod 2 has a hexagonal head 7 at the tip and a rod-shaped main body 8, and the base end of the main body 8 has a threaded portion reaching approximately the center. 9 is formed and configured.

Therefore, while inserting the lifting hole forming rod 2, the threaded portion 9 of the main body 8 is inserted into the threaded hole 4 of the nut member 5.
is screwed in to fix the lifting hole forming bar 2 to the outer mold 1 (see Fig. 2).

In addition, a reinforcing member 12 for reinforcing the lifting hole 11 is inserted through the main body 8 of the lifting hole forming bar 2 which is protruded between the inner mold 10 and the outer mold 1.

From this state, there is 1 concrete milk in the formwork.
3, but this concrete milk 13 often leaks from the through holes 3 of the outer mold 1,
It may get into the screw hole 4 of the nut member 5 and solidify there.

This will hinder the work of extracting the lifting hole forming bar 2 from the outer mold 1.

That is, in order to pull out the lifting hole forming bar 2, the lifting hole forming bar 2 is rotated and pulled out using the threading force of the screw, but the concrete milk 13 penetrates into the screw hole 4. When solidified, the threaded portion 9 of the lifting hole forming bar 2 comes into close contact with the screw hole 4, causing a problem that the lifting hole forming bar 2 cannot be rotated.

Further, if an attempt is made to rotate it forcibly, there is a risk that the lifting hole forming bar 2 may be bent or the outer mold 1 may be damaged, which has been a major problem in the past.

[Purpose of the Invention] This invention was devised to address the above-mentioned conventional problems, and it is possible to form concrete products such as U-shaped grooves with lifting holes more easily than in the past, and also to form these products. It is an object of the present invention to provide a formwork device for forming concrete products with a lifting hole that is free from the risk of damaging the lifting hole forming rod 2 or the outer mold 1 of the formwork used when forming the lifting hole.

[Structure of the Invention] In order to achieve the object of the invention, the formwork device for forming concrete products with lifting holes according to the present invention comprises an inner mold and an outer mold installed at a distance from the inner mold. A formwork device for forming a concrete product with a lifting hole in which the outer mold is provided with a through hole for a lifting hole, wherein a leg portion and a tip end of the leg portion are straddled at a position around the through hole of the outer mold. A mounting base consisting of a connecting plate arranged along the same axis and having an insertion hole drilled therein that communicates with the through hole is fixed, and a screw hole that communicates with the through hole and the insertion hole is provided on the connecting plate of the mounting base. This is characterized by a fixed nut member.

[Embodiments of the Invention] The present invention will be described below based on embodiments shown in the drawings.

FIG. 3 schematically shows a formwork apparatus according to the present invention.

This formwork device is for molding a U-shaped groove with a lifting hole, and has an inner mold 2 that has a substantially rectangular shape inside.
0, and an outer mold 21 is provided at a predetermined distance from the inner mold 20.

This outer mold 21 stands rotatably from a lower frame 22 and this lower frame 22, and closes both side frames 24, 24 having through holes 23, 23 approximately in the center and both ends of the both side frames 24, 24. It is composed of closing frames 25, 25.

By the way, the main parts of the formwork device according to the present invention are shown in FIG. 1, and further explanation will be given with reference to this figure. parts 26, 26 and this leg part 2
A mounting base 28 consisting of a connecting plate 27 spanning between 6 and 26 is fixed.

The connecting plate 27 of the mounting base 28 is provided with an insertion hole 29 at a position communicating with the through hole 23.

Further, a nut member 30 is fixed to the connecting plate 27, and a screw hole 31 formed inside the nut member 30 communicates with the through hole 23 and the insertion hole 29.

In the above process, the lifting hole forming bar 32 is inserted into the threaded hole 31 of the nut member 30, and the threaded portion 34 formed at the base end of the main body 33 of the lifting forming bar 32 is screwed into this threaded hole 31. , the lifting hole forming rod 32 is installed in the inner mold 20 and the outer mold 21.

In addition, the main body 33 located within the inner mold 20 and the outer mold 21
A reinforcing member 35 for reinforcing the lifting hole 39 is inserted through and arranged.

Here, the reinforcing member 35 is composed of a pipe-shaped base 36 that is inserted through the main body 33 of the lifting hole forming bar 32, and an anchor part 37 that is fixed in the middle of the base 36 and projects outward.

After filling concrete milk 13 from this state and curing it for a predetermined period, the mold is demolded, but first the lifting hole forming rod 32 is pulled out.

This pulling operation is performed by holding and rotating the hexagonal head 38 with rotating tools. That is, when the lifting hole forming bar 32 is rotated, the threaded portion 34 of the main body 33 and the nut member 3
The lifting hole forming bar 32 is pulled out due to the screwing force with the threaded hole 31 of 0, and finally the reinforcing member 35 is installed inside the concrete and the lifting hole is formed in the side wall of the U-shaped groove. A U-shaped groove will be formed.

By the way, as shown in FIG. 1, a nut member 30 is provided on the side frame 24 of the outer mold 21 via a mounting hole 28.

Therefore, even if the concrete milk leaks from the through hole drilled in the side frame 24 when filling the formwork with the concrete milk 13, the screw hole 31 of the nut member 30 will not be damaged at all. .

[Effects of the Invention] The present invention consists of the above configuration. With the formwork device for molding concrete products with lifting holes according to the present invention, concrete products such as U-shaped grooves with lifting holes can be formed more easily than before, and the lifting holes used in forming these can be formed more easily. There is no risk of damaging the bar material 2 or the outer mold 1 of the formwork.

As a result, the durability of the formwork device can be greatly improved, and the cost of the formwork can be extremely reduced.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of a main part showing an embodiment of the present invention, FIG. 2 is a sectional view showing a conventional example, and FIG. 3 is a schematic diagram showing an outline of a formwork apparatus. 1... Outer mold, 2... Bar material for forming a lifting hole, 3...
...Through hole, 4...Screw hole, 5...Nut member, 6...
... Side frame of the outer mold, 7 ... Head, 8 ... Main body, 9 ...
Threaded part, 10... Inner mold, 11... Lifting hole, 12
... Reinforcement member, 13 ... Concrete milk, 2
0...Inner mold, 21...Outer mold, 22...Bottom frame, 23
...Through hole, 24...Side frame, 25...Closing frame, 26
...Legs, 27...Connection plate, 28...Mounting base, 2
9...Insertion hole, 30...Nut member, 31...Screw hole, 32...Bar material for forming a lifting hole, 33...Main body, 34...Threaded portion, 35...Reinforcement member, 36...
... Base, 37 ... Anchor part, 38 ... Head, 3
9...Hoisting hole.

Claims (1)

[Claims] 1. A concrete product molding with a lifting hole, comprising an inner mold and an outer mold installed at a distance from the inner mold, the outer mold having a through hole for a lifting hole. In the formwork device for use in the formwork, a mounting plate comprising a leg and a connecting plate disposed straddling the tip of the leg and having an insertion hole in communication with the through hole is provided at a position around the through hole of the outer mold. A formwork device for molding a concrete product with a lifting hole, characterized in that a stand is fixed, and a nut member having a screw hole communicating with the through hole and the insertion hole is fixed on a connecting plate of the mounting stand.