JPH0116844Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a concrete formwork release device.
When demolding the concrete formwork used as the concrete frame for the construction of buildings, factories, etc. and retaining walls, etc. after solidification of the concrete material, it is easy and quick to remove the formwork without damaging the frame surface or the formwork itself. This invention relates to a mold release device that can be used to remove molds.

BACKGROUND OF THE INVENTION Concrete forms conventionally used to construct various concrete structures are constructed using predetermined supporting and fixing means, and are removed from the form after the cast concrete material has solidified. At that time, even if a stripping liquid or the like is applied to the back of the formwork to make it easier to release the mold from the concrete material, it is usually not easy to release the mold, so a so-called crowbar tool is used to forcefully release the mold. Sometimes I let them do it. However, when working with such tools,
Not only could the formwork be damaged, making it difficult to reuse it, but it could also damage the frame surface, greatly impairing the aesthetic appearance of the finished surface.

Therefore, this idea was devised to eliminate the conventional drawbacks mentioned above, and its gist is that the bowl is buried in the surface of the concrete frame to be constructed, and the opening edge is in contact with the back surface of the concrete formwork. A shaped cap body, a through bolt that penetrates the formwork and is rotatably connected to the inner surface of the bottom wall of the cap body, and a screw fastening means that penetrates the formwork and is pressed against the front and back surfaces of the formwork. By integrating the front and back plates, the formwork can be clamped, and either the front or back plate can be screwed to the through bolt so that it can move forward and backward as the bolt rotates. The invention consists in that it is equipped with a clamping body that can be held.

An embodiment of this invention will be described below with reference to the drawings.

Reference numeral 1 shown in the figure is a bowl-shaped cap body, which is buried in the C side of a concrete frame to be constructed as a wall body of a building, factory, etc., or retaining wall of an earth retaining wall, etc., and has an opening edge on the back side of the concrete formwork P. are coming into contact with each other. As shown in the figure, the cap body 1 is shaped like a smoothly bulging rounded truncated cone, with the opening end having a large diameter and the inner wall having a smaller diameter. By locating the wire at the back of the frame C, it is easy to remove the frame C after construction, and the open end is brought into close contact with the back surface of the formwork P without any gaps.

A through bolt 3 that penetrates through the formwork P is connected to the cap body 1, and the through bolt 3 itself is rotatably connected to the inner surface of the deep wall of the cap body 1, so that the cap body 1 can be connected to the formwork P. The rear end of the through bolt 3 when placed on the back surface is made to extend to the surface of the formwork P. In the illustrated example, the cap body 1 and the through bolt 3 are connected by welding a circular connecting plate 2 whose central portion is bulged to have a hat-like cross section to the inner surface of the bottom wall of the cap body 1. Fix it in contact,
This is achieved by drilling a connecting hole 2A in the center and connecting a connecting groove 3A cut on the periphery of the front end of the through bolt 3 with a loose fit to the edge of the connecting hole 2A. be. Therefore, although the through bolt 3 itself is connected to the cap body 1, it can freely rotate around its axis.
The rear end portion is crushed to form a knob portion 4.

A clamping body 5, which is clamped and fixed to the formwork P, is screwed to the through bolt 3, and if the through bolt 3 is rotated while the clamping body 5 is supported without rotating, the The male screw is the clamping body 5
It is now possible to move forward or backward. That is, the clamping body 5 includes a fastening bolt that allows the front plate 6 that is pressed against the surface of the formwork P and the back plate 7 that is similarly pressed against the back side of the formwork P to penetrate into the formwork P, and is screwed to this fastening bolt. The formwork P is integrated with each other via screw fixing means 8 consisting of nuts.
At the same time, by welding and fixing the nut body 9 that is screwed to the through bolt 3 to either the front plate 6 or the back plate 7, the nut body 9 and the front plate are fixed as the through bolt 3 rotates. Board 6, back board 7
The entire structure is designed to be able to move forward and backward.

Therefore, in the illustration, both the front plate 6 and the back plate 7 are circular, but this means that the back plate 7 is located inside the cap body 1 in contact with the back surface of the formwork P. Therefore, the purpose is to match the shape of the opening end which is circular, but other shapes such as rectangular or oval may also be used. The screw fastening means 8 consisting of fastening bolts and nuts is sufficient if the front plate 6 and the back plate 7 are integrated with each other in a state where the formwork P is clamped, and the number thereof is not limited to three as shown in the figure, but may be two. The number of fastening bolts may be four or more, and the same effect can be obtained by inserting the fastening bolts from either the front plate 6 or the back plate 7. Furthermore, although the nut body 9 is made into a square shape, there is no difference whether it is made into a hexagonal shape, and by making the front plate 6 or the back plate 7 into a plate shape with a sufficient thickness, the nut body It is also possible to omit 9. In addition, the illustrated screw connection between the clamping body 5 and the through bolt 3 is performed via a nut body 9 fixed to the back plate 7, but this is done by removing the formwork P from the frame C. This is to ensure that the demolding force applied at the time is applied evenly to the back surface of the formwork P.

This device is constructed as described above, and an example of its use will now be described with reference to FIGS. Through holes H1 and H2 are drilled through which the through bolts 3 and the fastening bolts of the screwing means 8 are inserted, and the front plate 6 and the back plate 7 arranged on the front and back sides of the formwork P are integrated with each other via the screwing means 8. By doing so, the formwork P is clamped by the clamping body 5, and while the through bolt 3 connected to the cap body 1 is screwed into the clamping body 5, the insertion hole H is inserted from the back side of the formwork P.
1, and by rotating the through bolt 3, the open end of the cap body 1 is brought into contact with the back surface of the formwork P. In this way, the formwork P in which the device of this invention is set is constructed in a conventional manner, and concrete material is cast and solidified to form a concrete frame C. When removing the formwork P after the curing period, when the through bolt 3 is rotated, the through bolt 3 and the cap body 1 are rotatably connected, so the cap body 1 is left as it is, but the clamping The cap body 1 is separated from the body 5 by the screw feeding action, and the formwork P is separated from the surface of the frame C. After that, either remove the cap body 1 from the frame C at the same time as the formwork P, or continue rotating the through-bolt 3 and remove the clamping body 5 holding the formwork P from the through-bolt 3, and then remove the through-bolt 3. 3. All you have to do is remove the cap body 1, and remove the clamping body 5 and cap body 1 from the formwork P by removing the screw fixing means 8.
The through bolt 3 provided with the attachment is reusable.

Therefore, by setting it in the concrete formwork P used when constructing the concrete frame C, it is possible to rotate the bolt 3 through the demolding operation of the formwork P after solidification of the cast concrete material. It can be easily carried out by chiseling, and in doing so, it does not cause any damage to the frame C surface and the formwork P, resulting in a frame C with a beautiful appearance, and the formwork P can be reused. It is something that makes you

In addition, the bowl-shaped cap body 1, which is buried in the surface of the building frame C and whose opening edge is in contact with the back surface of the formwork P, is rotated by a through-bolt 3 that is screwed to a clamping body 5 that is clamped and set on the formwork P. Therefore, at the time of setting, it comes into close contact with the surface of the formwork P, and the concrete material will not invade even due to the pressure, impact, etc. of the concrete material being placed. Therefore, the rotation operation of the through bolt 3 during demolding of the formwork P is not hindered in any way due to the fact that the through bolt 3 is rotatably connected to the inner wall of the cap body 1.
The forward movement of the holding body 5 within the cap body 1 is made smooth, and the detachment of the cap body 1 itself from the frame body C after demolding the formwork P is also facilitated.

On the other hand, the clamping body 5 clamps the formwork P by integrating the front plate 6 and the back plate 7 which are in pressure contact with the front and back surfaces of the formwork P via screw fixing means 8 inserted through the formwork P. Since it is attached, it is integrated with the formwork P, and when the through bolt 3 is rotated while it is screwed to the through bolt 3, the clamping body 5 itself and the mold that is integrated with this 5 are removed. To surely advance a frame P and to smoothly release the mold from the C surface of a skeleton.

Furthermore, the cap body 1 and the through bolt 3 are connected to the inner surface of the bottom wall of the cap body 1 so as to be rotatable, so they are integrated. , either the front panel 6 or the back panel 7 is screwed to the through bolt 3, so each member 1, 3, 5 is assembled as an integral piece, and handling on site is easy. This has extremely beneficial effects in practice, such as ease of parts management.

[Brief explanation of drawings]

The drawing shows one embodiment of this invention.
The figure is an exploded perspective view, Figure 2 is a sectional view in use,
FIG. 3 is a sectional view at the time of detachment. C...Concrete frame, P...Concrete formwork, H1, H2...Insertion hole, 1...Cap body, 2...Connection board, 2A...Connection hole, 3...Through bolt, 3A...Connection groove , 4... knob section, 5...
Clamping body, 6...Front plate, 7...Back plate, 8...Screw fixing means, 9...Nut body.

Claims (1)

[Scope of utility model registration request] A bowl-shaped cap body that is buried in the surface of the concrete frame to be constructed and whose opening edge touches the back surface of the concrete formwork, and a through hole that penetrates the formwork and is rotatably connected to the inner surface of the bottom wall of the cap body. By integrating the front and back plates, which are in pressure contact with the front and back surfaces of the formwork through bolts and screwing means inserted through the formwork, the formwork can be clamped, and the front and back plates can be attached to each other. A concrete formwork releasing device comprising a clamping body screwed to a through bolt so that either one of the through bolts can move forward and backward as the through bolt rotates.