JP3022707B2 - Concrete formwork and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete formwork for casting, for example, a cloth-based concrete and a method of manufacturing the same.
It is about the law .

[0002]

2. Description of the Related Art In general, for example, when laying a cloth-based concrete, a plurality of concrete forms are combined vertically and horizontally. Each concrete form is provided with a forming plate, the left and right sides thereof are bent at right angles to form a pair of side plates, and the upper and lower ends of the forming plate are also bent at right angles to form a pair of horizontal reinforcing plates. Is formed. Conventionally, as a method of bending the formed plate at a right angle, as shown in FIG.
a between the first forming die 2 having a and the second forming die 3 having the right-angled V-shaped forming portion 3a, the two forming dies 2 and 3 are brought close to each other, and the formed plate 1 is bent at a right angle. It has become.

[0003]

However, in the above-mentioned conventional bending method of the formed plate 1, the V-shaped groove 2 is formed.
The curved surface M having the same radius as the plate thickness is formed at the outer corner of the bent portion C of the molded plate 1 by the a and the V-shaped molded portion 3a. For this reason, as shown in FIG. 6, a groove K is formed between the curved surfaces M, M in a state where the concrete form using the molded plate 1 is joined to each other, as shown in FIG. Therefore, after casting the concrete, there is a problem that the seam streak is formed by the groove K on the concrete forming surface. In addition, when the overcoat is applied to the molding surface of the concrete, there is no problem in the appearance of the streaks, but when the overcoat is not applied, it becomes a problem.

[0004] It is an object of the present invention to provide a concrete formwork capable of preventing formation of seam streaks on a concrete molding surface by eliminating a groove formed at a joint portion of a plurality of forms during concrete casting. It is in.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a concrete form according to the first aspect of the present invention.
In a concrete form in which a side plate is formed by bending at least one side of a formed plate in contact with concrete at the time of placing concrete, a V-shaped groove formed in advance inside a bent portion between the formed plate and the side plate. Slip based on the deformation of
In this case, a curved surface at the outer corner of the bent portion is reduced. Also, in claim 2
In the invention of the method of manufacturing a concrete form,
Forming a V-shaped groove inside the bent portion between the forming plate and the side plate,
Then, the V-shaped groove portion is deformed inward to form the bent portion.
A slit is formed on the inside of the bend, and the outer corner of the bent portion is bent.
We take measures to make the surface smaller.

[0006]

According to the present invention, V is applied to the inner corner of the bent portion of the formed plate.
By forming a V-shaped groove and deforming the V-shaped groove inward,
Since the slit is formed, the curved surface at the outer corner of the bent portion is reduced. For this reason, in the state where the plurality of concrete forms are joined to each other, the groove formed at the joint (joint) is also extremely small, so that the joint streaks on the concrete molding surface are negligible, and there is no aesthetic problem. .

[0007]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. First, a method of bending the formed plate 1 used for the concrete formwork will be described. In this embodiment, as shown in FIGS. A V-shaped groove 1a having an angle α is formed. A V-shaped groove 2a having an angle β slightly smaller than a right angle is formed on the upper surface of the first mold 2. Further, a second mold 3 is provided at a position corresponding to the V-shaped groove 2a so as to be able to reciprocate up and down. A V-shaped forming part 3a having a forming angle γ slightly smaller than a right angle is formed below the second forming die 3.

[0008] In order to bend the formed plate 1 at right angles by using the two forming dies 2 and 3, as shown in FIG.
While placing the molding plate 1 horizontally on the upper surface of the molding die 2,
The second forming die 3 is made to correspond to the V-shaped groove 1a of the forming plate 1. When the second molding die 3 is moved downward in this state, the molding plate 1 is bent at a right angle as shown in FIG. At this time,
Since the bottom of the V-shaped groove 1a of the formed plate 1 is the thin portion 1b, the outer corner of the bent portion C of the formed plate 1 is formed into a curved surface M having a very small curvature according to this thickness. .

The reason why the formation angle β of the V-shaped groove 2a and the formation angle γ of the V-shaped part 3a are slightly smaller than 90 ° is that the forming plate 1 and the side plate are formed immediately after the forming of the forming plate 1 is completed. 1
This is to ensure that c (1d) becomes exactly 90 ° in a state of elastic deformation.

The formed plate 1 formed in this way is shown in FIG.
As shown in FIG. 1, it is used, for example, as a concrete forming form 5 for placing cloth-based concrete. This formwork 5 is formed by bending the left and right and upper and lower sides of the formed plate 1 at right angles,
Left and right reinforcing side plates 1c, 1d and upper and lower reinforcing side plates 1e, 1
f. The formed plate 1 and the reinforcing side plates 1c, 1
A slit S in which the V-shaped groove 1a is deformed is formed in the bent portion C with d.

Further, in order to join the mold frames 5 to each other in the concrete mold frame 5, a mounting bracket 6 is welded and fixed to the back surface of the forming plate 1, and a guide hole 6a penetrated through the mounting plate 6 and the side plate. A guide rod 7 is supported so as to be able to reciprocate in the left-right direction with a guide hole 1g provided in 1c. Further, in the middle of the guide rod 7, the side plates 1 of the two mold frames 5, 5 joined to each other are provided.
A U-shaped fitting 8 for holding c and 1d is connected. A plurality of reinforcing members 9 are welded and fixed in the longitudinal direction to the back surface of the formed plate 1.

Since the curved surface M at the outer corner of the bent portion C is very small as shown in FIG. K is also very small. For this reason, when the cloth foundation concrete is cast,
There is no noticeable seam streak formed on the molding surface of the concrete, and the concrete is finished finely.

The present invention is not limited to the above embodiment, but can be embodied as follows. (1) The depth of the V-shaped groove 1a is appropriately changed according to the thickness of the formed plate 1.

(2) When joining another concrete form to the four sides of the concrete form, the V-shaped groove 1a is provided on each side. (3) Although the slit S of the bent portion C between the molded plate 1 and the side plate 1c (1d) is a small gap in the above embodiment, a V-shaped groove-shaped slit S is formed instead. The forming angle α of the V-shaped groove 1a of the formed plate 1 is set to be large in advance so as to make it.

[0015]

As described above in detail, the present invention can prevent a groove from being formed at a joint portion of a plurality of concrete form forming plates, and as a result, seam streaks are formed on a concrete forming surface. There is an effect that can be prevented.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a forming plate constituting a formwork embodying the present invention.

FIG. 2 is a perspective view of a concrete formwork.

FIG. 3 is a perspective view showing a method of bending a formed plate.

FIG. 4 is a sectional view showing a method of bending a formed plate.

FIG. 5 is a cross-sectional view showing a state in which bending of a formed plate has been completed.

FIG. 6 is a cross-sectional view showing a joined state of a formed plate formed by a conventional processing method.

FIG. 7 is a cross-sectional view showing a conventional method for bending a formed plate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Molded board, 1a ... V-shaped groove, 1b ... Thin part, 1c, 1d
... side plate, C ... bent part, M ... curved surface, S ... slit.

Claims (2)

(57) [Claims] 1. Contact with concrete at the time of concrete casting
In a concrete formwork in which at least one side portion of a forming plate to be bent is bent at a right angle to form a side plate , based on a deformation of a V-shaped groove previously formed inside a bent portion between the forming plate and the side plate.
A concrete formwork in which a slit is formed and a curved surface at an outer corner of the bent portion is reduced. 2. The concrete comes into contact with the concrete during casting.
At least one side of the molded plate to be bent at right angles
In the method of manufacturing concrete formwork with
A V-shaped groove is formed inside the bent portion between the forming plate and the side plate.
Then, the V-shaped groove portion is deformed inward to fold
A slit is formed inside the bent portion, and the outer corner of the bent portion is formed.
Characterized in that the curved surface of the
A method of manufacturing a reed formwork.