JPH0128191Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an opening stopper for beam formwork that can be reasonably and reliably constructed without using a separator when assembling beam formwork at a construction site.

Conventionally, as assembly members or supporting metal fittings for this type of beam formwork, as shown in Japanese Utility Model Publication No. 56-43476, a rear wall part that directly abuts the back side of the vertical batten material is provided integrally at the rear of the strip plate, or A technique has been disclosed in which a hole is drilled through the vertical butter from the side surface and the hole is integrally connected and fixed to the side wall of the strip plate using a fixing pin.

In addition, as in Japanese Utility Model Publication No. 57-59549, a side plate is provided facing downward behind the upper plate of the support bracket, a slot is bored in this, and a wedge for pressing the back side of the vertical butter is inserted into this slot. A technique for tightening the vertical butterfly material by fitting it in is disclosed.

However, in the former case, the side pressure that spreads due to concrete placement acts directly on the rear wall through the vertical flaps, so when the vertical flaps are pulled downward during demolition, a considerable tensile force is applied. It is difficult without
This is unreasonable, as it reduces the efficiency and danger of demolition work.

In addition, if the dimensional accuracy of the formwork, upper end batten material (commonly known as crosspiece), and vertical batten material is not high, there may be cases where the vertical batt material cannot fit into the cavity in the rear wall.
The beam formwork often does not tighten due to gaps.

Therefore, there are serious drawbacks such as not only the efficiency of assembly work is significantly reduced, but also reliable construction is not achieved and construction accuracy is lowered.

Although the latter can overcome the above-mentioned drawbacks of the former, it involves the dangerous work of driving wedges into the top of the beam formwork, and especially during demolition work, it is difficult to secure scaffolding indoors. Furthermore, the wedge must be removed by hitting it with a hammer or the like in a very narrow area directly under the slab formwork, which is highly dangerous and inefficient, which is a serious drawback in practical terms.

This invention was devised in view of the above-mentioned conventional problems and to eliminate serious practical drawbacks.The purpose was to assemble beam formwork rationally and efficiently, and to perform dismantling work. The purpose of the present invention is to provide an opening stopper for beam formwork that is excellent in safety and efficiency, and has sufficient durability and practical effects.

In order to achieve the above object, this invention provides a slab formwork locking piece to project upward and a beam formwork locking piece to project downward at one end of the board body. , characterized in that side wall pieces are arranged facing each other at a required interval on both sides of the other end of the board main body, and a vertical butterfly support pin is mounted between the side wall pieces so as to be rotatably supported. shall be.

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

FIG. 1 is a plan view of an opening stopper according to a first embodiment of the present invention, and FIG. 2 is a central vertical sectional view thereof.

The opening stopper for the beam formwork shown in both figures includes a slab formwork locking piece 2 which is bent at one end of a strip-shaped board body 1 by a required width at the center of the width direction and protrudes upward. , beam formwork locking pieces 3, 3 which are bent at both sides and protrude downward are provided, respectively.

Furthermore, at the other end of the board main body 1, an opening 4 is formed from near the center of the top surface to the rear, leaving both side edges and the rear edge, and both sides of the opening 4 are cut downward. The side wall pieces 5, 5 were arranged facing each other at a required interval.

Elongated pin support holes 6, 6 are formed in the side wall pieces 5, 5, respectively, and a vertical butterfly support pin 7 is rotatably supported between the pin support holes 6, 6. It is installed.

Note that 1a indicates a nailing hole drilled near one end of the board body 1.

Further, the vertical butterfly support pin 7 can also be slid up and down along the pin support holes 6, 6.

Next, a method of using the opening stopper of the first embodiment configured as described above will be explained.

As shown in Figures 3 and 4, the beam formwork p
The side plates p1 are maintained at a distance by the lower separator S (a separator S1 is also installed in the middle layer if necessary), and the vertical butter material B is held from the outside by the formwork clamping rod F and clamping fitting A. Press against crosspiece C and tighten.

Further, at the upper end of the beam form p, an opening stopper is attached to the beam form locking pieces 3, 3 at one end of the board main body 1.
is locked to the inner end of the side plate p1 and fixed by nailing N, and at the same time, the upper end back surface of the vertical flap material B is attached at a required interval to be supported by the vertical flap support pin 7.

Subsequently, the slab formwork p2 is laid so as to be locked to the slab formwork locking pieces 2 of the substrate body 1.

After pouring concrete inside the beam formwork and on the slab formwork and curing it, remove the lower clamping fittings C, etc. and pull out the vertical flap material B of the beam directly below, or remove the vertical flap material as shown in the imaginary line. After pulling out the material B while rotating it outward and rearward, the side plate p1 of the beam form p is dismantled and the opening stopper is removed for reuse.

The bottom plate of the beam formwork p and the slab formwork p2 may be dismantled after that.

In the opening stopper of this first embodiment, when the vertical butterfly material is pulled out, the vertical butterfly support pin 7 that presses the back side rotates or is pushed upward along the pin support holes 6, 6 while rotating. As a result, the friction with the vertical flap material B is small, making the initial demolition work efficient and safe, and work in the narrow space directly under the slab formwork is hassle-free and efficient. be.

Furthermore, since the structure is simple and no accessories such as wedges are required, it is convenient to handle and economically advantageous.

Next, another embodiment of the present invention will be described.

The opening stopper according to the second embodiment of the present invention, shown in FIG. The vertical butterfly support pin 27 is rotatably supported in the pin support holes 26, 26 provided in the side wall pieces 25, 25. By doing so, the same effects as described above can be obtained. In addition, in the first embodiment and the second embodiment, openings 4 and 2 are provided near the center of the substrate body.
4, and by cutting and bending both sides downward or upward to provide side wall pieces 5, 5, 25, 25, it can be integrally formed from a single iron plate without waste, and is lightweight and convenient to handle. .

The opening stopper according to the third embodiment of the present invention shown in FIG. 6 has side wall pieces 35, 35 arranged facing each other by bending both sides of a strip-like board body 31 downward, and pins drilled therein. A vertical butterfly support pin 37 is rotatably supported in the support holes 36, 36, and the same effect as described above can be obtained.

FIG. 7 is a vertical cross-sectional view of the main part of the opening stopper according to the fourth embodiment of the present invention, in which a claw piece 1b of an appropriate length is formed near one end of the board main body 41 with the board main body 41 facing downward. This has the effect that nailing to the crosspiece C can be done easily, easily, and safely by directly hitting this board body 41.

Furthermore, as another embodiment of the present invention, even if the pin support hole is made circular, the same effects as described above can be obtained by rotatably supporting the vertical butterfly support pin.

As explained in detail above, this invention maintains the most important performance of preventing the beam formwork from opening, and also improves efficiency by allowing the beam formwork to be assembled efficiently, reliably, and easily. It is a beam form that is highly durable, easy to handle, and extremely superior in practical use.It has the effect of making it possible to pull out vertical batten materials efficiently, easily, and safely, especially when dismantling beam formwork. This allows you to obtain a metal fitting to stop the frame from opening.

[Brief explanation of the drawing]

1 and 2 are a plan view and a central vertical sectional view of the first embodiment of the present invention, FIGS. 3 and 4 are illustrations of the opening stopper of the first embodiment in use, and FIG. 2
A perspective view of the embodiment, FIG. 6 is a front view of the third embodiment,
FIG. 7 is a central vertical sectional view of the main part of the fourth embodiment. 1... Board body, 2... Slab formwork locking piece, 3
...Beam formwork locking piece, 5...Side wall piece, 7...Support pin for vertical flap, p...Beam formwork, p2...Slab formwork, B...Vertical butterfly material, S...Separator, F...
...Formwork tightening rod.

Claims (1)

[Scope of utility model registration request] A slab formwork locking piece is provided to protrude upward at one end of the board body, and a beam formwork locking piece is provided to protrude downward, and at both sides of the other end of the board body. A fixture for preventing the opening of a beam form, characterized in that side wall pieces are arranged facing each other at a required interval, and a support pin for a vertical flap is attached to rotatably support the side wall pieces between the side wall pieces.