JPH0116845Y2 - - 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. The present invention relates to a mold release device that is easy to handle, repurpose, and manage.

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 structure 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 bowl-shaped cap body, a through bolt that penetrates the formwork and is rotatably connected to the cap body, a front plate and a back plate that are pressed against the front and back surfaces of the formwork, and a fixed cylinder that penetrates the formwork. It consists of a clamping body that is integrated at the front and rear to clamp the formwork, and has a fixed cylinder screwed to the through bolt so that it can move forward and backward as the through bolt rotates. It is.

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

The reference numeral 1 shown in the figure is a roughly bowl-shaped cap body made of synthetic resin such as nylon resin, and is buried in the C side of a concrete frame to be constructed as a wall of a building, factory, etc., or a retaining wall of an earth retaining structure. The opening edge is placed in contact with the back surface of the concrete formwork P. As shown in the figure, the cap body 1 has a hollow, approximately truncated conical shape, with the opening end having a large diameter and the inner wall having a smaller diameter. By locating it on the side, it can be easily removed after building the frame C, and the open end is in 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 this cap body 1, and the front end of the through bolt 3 itself is rotatably connected to the inner wall of the cap body 1, so that the cap body 1 When the through bolt 3 is placed on the back side of the formwork P, the rear end of the through bolt 3 is exposed to the surface of the formwork P. In the illustrated example, the cap body 1 and the through bolt 3 are connected by a through hole drilled in the deep wall of the cap body 1, which is made thick to prevent damage during connection and to be strong. 2,
After the front end 3A of the through bolt 3 having a small diameter is loosely inserted, it is expanded and engaged with the step formed on the front side of the through hole 2, and the inside of the through hole 2 is sealed. Stopper 2
A is fitted inside, and furthermore, in order to ensure smooth idling of the through bolt 3 itself, there is a part that engages with the stepped part,
A washer 3B may be interposed in each large diameter portion of the through bolt 3 at the rear end opening of the through hole 2.
Therefore, although the through bolt 3 itself is connected to the cap body 1, it can freely rotate around its axis, and in order to facilitate rotational operation, the rear end portion of the through bolt 3 is crushed. Knob part 4
It has been done.

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 connects the front plate 6 which is pressed against the surface of the formwork P, and the back plate 7 which is also pressed against the back surface and can be stored in the cap body 1, into a fixed tube inserted through the formwork P. By integrating the front and rear parts of the fixed cylinder 8 into the frame P, the female thread formed on the inner peripheral surface of the fixed cylinder 8 is screwed to the male thread of the through bolt 3, thereby controlling the rotation of the through bolt 3. The fixed cylinder 8, the front plate 6, the back plate 7, etc. are all made to be movable forward and backward. In addition, the fixed tube 8
Both the front plate 6 and the back plate 7 which are integrated with the fixed cylinder 8 may be screwed to the fixed cylinder 8.

Therefore, in the illustrated clamping body 5, either a front plate 6 or a back plate 7, which are formed into a substantially hexagonal nut shape, are integrally connected to a fixed cylinder 8 in the form of a flange, and the other is connected to a fixed cylinder 8. 8 and is screwed externally.
According to this, the insertion hole H matches the outer diameter of the fixed cylinder 8.
is drilled into the concrete formwork P, and the male threaded part of the fixing tube 8 is inserted into this hole H so that it protrudes to the other side, and either the front plate 6 or the back plate 7 is attached to the protruded male threaded part. By screwing in, the front and back surfaces of the formwork P are clamped together in a press-welded state by cooperation with the other plates 7 and 6, and by screwing only either the front plate 6 or the back plate 7, It is firmly integrated with the formwork P without being separated. At that time, by integrating the back plate 7 into the fixed cylinder 8 and screwing the front plate 6, the screwing work can be done without knowing the front side of the formwork P, which not only improves work efficiency. , it is possible to re-screw the screws if they loosen during demolding, and the demolding force when demolding the formwork P from the frame C is applied to the back surface of the formwork P through the back board 7. This has the advantage of ensuring that this is done. Furthermore, with the clamping body 5 inserted into the formwork P and set, the fixing cylinder 8 is also rotated integrally by the back plate 7, so that the through bolt 3 can be inserted into either the front or back side of the formwork P. The crocodile can be advanced and removed, making it convenient for dismantling.

Reference numeral 9 in the figure is an attachment nut that is fitted onto the crushed knob 4 formed at the rear end of the through bolt 3, and the through bolt 3 can be removed by using a versatile tool such as a ratchet trench. It helps to smoothly carry out rotation work.

This device is constructed as described above, and an example of its use will now be described with reference to FIGS. A through hole H is drilled through which the fixed cylinder 8 is inserted in the clamping body 5 screwed to the through bolt 3, and the fixed cylinder is secured by screwing the front plate 6 and the back plate 7 arranged on the front and back of the formwork P to each other. While clamping the formwork P with the clamping body 5 that is set by integrating it into the cap body 8, the through bolt 3 connected to the cap body 1 is screwed into the fixing cylinder 8 and penetrates into the insertion hole H from the back side of the formwork P. The opening end of the cap body 1 is brought into contact with the back surface of the formwork P by inserting the cap body and rotating the through bolt 3, or by rotating the through bolt 3.
is screwed into the clamping body 5 to make it into one piece beforehand, and after inserting it into the formwork P with the fixed cylinder 8, it is clamped by screwing either the front plate 6 or the back plate 7 into the fixed cylinder 8. The body 5 is set in the formwork P, and then the open end of the cap body 1 is brought into contact with the back surface of the formwork P by rotating the through bolt 3. In this way,
The formwork P in which this device is set is constructed in a conventional manner, and concrete is poured and solidified to form a concrete frame C. When demolding the formwork P after the curing period, when the through bolt 3 is rotated, the cap body 1 is left as it is because the through bolt 3 and the cap body 1 are rotatably connected, but the clamping The body 5 separates from the cap body 1 due to the screw feeding action, and the formwork P due to the reaction corresponding to the screwing force of the through bolt 3.
is detached from the C-plane of the skeleton. 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 pass the bolt 3 through the clamping body 5 that still holds the formwork P.
After removing the through bolts 3 and the cap body 1 from the frame C, it is sufficient to remove it from the formwork P by removing the front panel 6, in some cases the back panel 7, and even the fixed tube 8. The clamp body 5 and the through bolt 3 with the cap body 1 are 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, making the frame C having a beautiful appearance, while also making it possible to reuse the formwork P. It is something.

In addition, a substantially 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. When set by operation, it comes into close contact with the surface of the formwork P, and the concrete material will not penetrate even due to the pressure, impact, etc. of the concrete material being placed. Therefore, since the through bolt 3 is rotatably connected to the cap body 1, the rotation operation of the through bolt 3 during demolding of the formwork P is not hindered in any way, and the operation inside the cap body 1 is not hindered. The forward motion of the back plate 7 in the clamping body 5 is made smooth, and the cap body 1 itself is easily detached from the frame C after demolding the formwork P.

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, with a fixed cylinder 8 inserted into the formwork P at the front and back. Since the fixed cylinder 8 is attached to the through bolt 3, it is integrated with the formwork P, and when the through bolt 3 is rotated with the fixed cylinder 8 screwed to the through bolt 3, the clamping body 5
To surely advance the mold itself and the formwork P integrated with this 5, and to smoothly release the mold from the surface of the frame C. In particular, since the fixed cylinder 8 in the clamping body 5 is inserted into the formwork P while being screwed to the through bolt 3, one insertion hole H that matches the outer diameter of the fixed cylinder 8 is opened in the formwork P. It is only necessary to drill holes, and the formwork P
The work can be carried out efficiently because the work of clamping and fixing it is easy, and since no small parts are used, there is no risk of loss and it is easy to handle.
It is convenient for diversion and management.

Further, the cap body 1 and the through bolt 3 are integrated because the through bolt 3 is rotatably connected to the cap body 1, and the clamp body 5 is connected to its fixed cylinder. Since the bolt 3 is screwed through the bolt 8, the members 1, 3, and 5 are combined as an integral part, which is convenient for practical use, such as easy handling and parts management on site. It has extremely beneficial effects.

[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, H... Insertion hole, 1... Cap body, 2...
Through hole, 2A...Sealing plug, 3...Through bolt, 3A
...Front end, 3B... Washer, 4... Knob part,
5... Clamping body, 6... Front plate, 7... Back plate, 8...
Fixed barrel, 9...attachment nut.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A substantially bowl-shaped cap body which is buried in the surface of the concrete frame to be constructed and whose opening edge abuts the back surface of the concrete formwork, and which is rotatable into the cap body by penetrating the formwork. The through bolts that are connected together, the front and back plates that are brought into pressure contact with the front and back surfaces of the formwork are integrated at the front and back with a fixed cylinder that penetrates the formwork, and the formwork is clamped and the through bolts are connected. 1. A concrete form mold release device comprising a clamping body which is made by passing a fixed cylinder and screwing it to a bolt so that it can move forward and backward as the concrete formwork rotates. 2. The clamping body has either the front panel or the back panel integrally connected to a fixed tube in a flange shape, and the other is screwed to the fixed tube in an externally fitting manner, as set forth in claim 1 of the utility model registration claim. Concrete formwork release equipment.