JPH0672492B2 - Rib material for reinforcing concrete formwork - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing rib material for concrete formwork.

[0002]

2. Description of the Related Art A conventional concrete formwork 1 for molding a housing foundation concrete will be described with reference to FIG. 1. Reinforcing frames are provided on the upper and lower edges of a form body 2 made of a steel plate and having a flat concrete forming surface 2a. 3 is bent and formed in the direction opposite to the concrete molding surface 2a. Its reinforcement frame 3
A pair of rectangular pipe-shaped connecting members 4 extending in the vertical direction are welded and fixed to both sides of the form body 2 on the side surfaces, and connecting holes 5 are formed through the connecting members 4. A guide plate 6 as a reinforcing rib material is welded and fixed to the mold body 2 so as to face one of the connecting members 4, and a guide hole 7 corresponding to the connecting hole 5 is transparently provided in the guide plate 6. Has been done.
A connecting rod 8a is rotatably and laterally movably inserted into the connecting hole 5 and the guide hole 7, and a U-shaped holding portion 8b is fixed to the connecting rod 8a. Part 8b
And form a connecting pin 8. In addition, three reinforcing ribs 9 are welded and fixed to the back surface of the mold body 2.

As shown in FIGS. 2 and 3, the guide plate 6 as a conventional reinforcing rib member is formed by bending a long steel plate having straight side edges into a substantially L-shaped cross section. To form a fixing portion 10 for fixing to the frame body 2 and a guide portion 11 for supporting the connecting pin 8, and a protrusion 12 for spot welding is formed on the fixing portion 10 to be formed outward. In addition, the guide hole 7 is provided through the guide portion 11.

[0004]

However, in the above-mentioned conventional guide plate as a reinforcing rib material, a long steel plate having straight side edges is simply bent into an L shape. However, there has been a problem that the manufacturing cost is high because no measures have been taken for saving the material and maintaining the strength.

An object of the present invention is to provide a rib material for reinforcing a concrete formwork, which can reduce the weight and the material while maintaining the strength.

[0006]

In order to achieve the above object, the present invention provides a reinforcing rib material for a concrete formwork, wherein one side formed by bending a steel plate is fixed to the formwork body. A concave cut is formed from one side edge of the steel plate, and a bulge having a convex shape having the same shape as the cut is formed at the other side edge at a position corresponding to the concave cut, and between the cut inner side edge and the other side edge. Is provided with at least one bent portion, and a reinforcing protrusion is stamped and formed between the bent portion and the other side edge.

[0007]

The function of the reinforcing rib material is reduced and the material is saved by forming the notch. Further, the reinforcing protrusion is formed without increasing the weight by the stamping formation, and the reinforcing protrusion strengthens the strength against the deformation force.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIG.
14 to FIG. 4 to 6 show a guide plate 21 as a reinforcing rib member, and a plate member made of a vertically long (long) rectangular metal such as steel is a bending curve as a bent portion in the vertical direction (longitudinal direction). A fixed portion 22 and a guide portion 23 that are substantially orthogonal to each other are formed by bending at aa to have a substantially L-shaped cross section. The width of the guide portion 23 is almost twice as long as the width of the fixed portion 22. The fixed portion 22 is formed with a protrusion 24 for spot welding, and the guide portion 23 has a guide hole 25. Is transparently installed. A pair of grooves 26 (may be one) is provided on the inner peripheral surface of the guide hole 25. In addition, the folding curve aa and the guide hole 25
A reinforcing protrusion 27 extending in the vertical direction is formed in the guide portion 23 between and.

At a position corresponding to the reinforcing protrusion 27, the fixing portion 22 is provided with a cut 28 extending from its side edge to a folding curve aa, and the weight of the guide plate 21 is reduced while maintaining the mechanical strength. We are trying to save material. Therefore, the notch 28 forms the protrusion 22a.

Further, a cut 29 is formed from the side edge to the middle of the guide portion 23 so as to leave the periphery of the guide hole 25 and the reinforcing projection 27, and the weight of the guide plate 21 is reduced and the material is saved. ing. Therefore, the notch 29 forms the protrusion 23a as a bulge. In addition, the notch 29 has a fold line a in order to maintain the strength of the guide plate 21.
It is necessary to form so as not to reach −a.

The guide plate 21 as a reinforcing rib member constructed as described above is manufactured as follows. Figure 7
As shown in FIG.
And the cutting line b- so that the protrusions 22a and 23a are formed.
Cut along b. Next, the guide hole 25 and the pair of grooves 26 are bored and bent along the folding curve aa, and the reinforcing protrusion 27 and the protrusion 24 are formed. Therefore, the inner peripheral edge of the cut 28 and the outer peripheral edge of the projection 23a have the same shape, and the inner peripheral edge of the cut 29 and the outer peripheral edge of the projection 22a have the same shape, so that no material is wasted.

Further, in this embodiment, since the guide portion 23 is easily deformed by the notches 28 and 29, it is reinforced by the reinforcing protrusion 27, so that the deformation and the change of the position of the guide hole 25 and its peripheral portion are prevented. It can be prevented without increasing the plate thickness. Further, since the reinforcing protrusion 27 is formed by stamping as described above, the reinforcing protrusion 27 does not increase the weight.

Even if the plate thickness is made thin, the provision of the reinforcing projection 27 makes it possible to prevent deformation of the guide hole 25 and its peripheral portion, and to reduce the weight and material. Further, if the plate thickness is the same as the conventional one, the effect of preventing the deformation of the guide hole 25 and the peripheral portion thereof is improved while the weight of the guide plate 21 as the reinforcing rib material remains unchanged.

Next, an example in which the guide plate 21 as the reinforcing rib material of this embodiment is used in the concrete form 30 will be described with reference to FIGS. Reinforcement frames 32 are formed by bending in the opposite direction to the concrete molding surface 31a at the upper and lower edges of the mold body 31 having a flat concrete molding surface 31a. A pair of square pipe-shaped connecting members 33 extending in the vertical direction are welded and fixed to both sides of the form body 31 on the side surface of the reinforcing frame 32, and connecting holes 34 are formed through the connecting members 33. Further, the guide plate 21 as the reinforcing rib material of this embodiment is provided on the formwork main body 31 so as to face the one connecting member 33 and the projection 24 of the fixing portion 22.
Is spot-welded, and the guide hole 25 corresponds to the connecting hole 34. A connecting rod 35a is rotatably and laterally movably inserted and supported in the connecting hole 34 and the guide hole 25, and a U-shaped holding portion 35b is fixed to the connecting rod 35a. Further, the connecting rod 35a is provided with a protrusion 35c that can pass through the groove 26 of the guide hole 25.
The connecting pin 35 is configured by a, the sandwiching portion 35b, and the protrusion 35c. In addition, three reinforcing ribs 36 as reinforcing rib members for reinforcing the concrete form 30 together with the guide plate 21 are welded and fixed to the back surface of the form body 31.

Now, in order to connect two concrete formwork 30 adjacently, as shown in FIG. 10, connecting members 33 are joined to each other, and a connecting rod 35a is inserted into the connecting hole 34 to hold the sandwiching portion. Both connecting members 33 are sandwiched by 35b.
Further, after rotating the connecting pin 35 in the clockwise direction in FIG. 11 so that the holding portion 35b is disengaged from the connecting member 33, if the connecting rod 35a is moved to the right as shown in FIG. The sandwiched state is released. In this case, the protrusion 35
The connecting rod 35a does not come off from the inside of the connecting hole 34 due to the contact between the guide plate 21 and c.

Further, as shown in FIG.
As shown in FIG. 14, the connecting pin 3 is rotated in such a manner that the connecting pin 35 is rotated upward so as to raise b and the protrusion 35c is disposed at a position corresponding to the groove 26 of the guide hole 25.
When 5 is moved to the right, the projection 35c passes through the groove 26 and the connecting rod 35a is removed from the connecting hole 34. And
If the connecting pin 35 is moved to the left front side in this state, the connecting pin 35 can be detached from the concrete form 30. In this case, as shown in FIGS. 11 and 13, there is no problem because the diameter of the guide hole 25 is larger than the diameter of the connecting rod 35a with a margin. Further, the connecting pin 35 is attached to the concrete form 3 in the reverse order of the above.
Can be attached to zero. Therefore, the damaged connecting pin 35 can be replaced.

A deforming force is applied to the guide plate 21 as a reinforcing rib material used as described above by operating the connecting pin 35. Further, as is well known, concrete pressure is applied to the concrete molding surface 31a when pouring concrete, but this also causes a deformation force to be applied to the guide plate 21.
However, by providing the reinforcing protrusions 27 on the guide plate 21, the guide plate 21 is less likely to be deformed. Therefore,
The life of the concrete formwork 30 is extended.

It is considered that the reinforcing projection 27 is most effective when it is provided at an intermediate portion between the bending hole aa of the guide plate 21 as the reinforcing rib material and the guide hole 25. The effect of preventing the deformation of the guide hole 25 should be produced at any of the positions. In addition, a plurality of short reinforcing protrusions 27 may be intermittently arranged side by side. Further, if the notches 28, 29 and the reinforcing protrusions 27 are provided not only on the guide plate 21 but also on the reinforcing ribs 36 as other reinforcing rib members, the mechanical strength of each reinforcing rib 36 is improved. At the same time, the manufacturing cost of the concrete formwork 30 as a whole can be further reduced.

[0019]

As described in detail above, according to the present invention, since the strength of the reinforcing ribs is reinforced against the deformation force applied to the reinforcing ribs, the reinforcing ribs can be formed without increasing the plate thickness. The deformation of the material can be prevented, and since the reinforcing protrusion is formed by stamping, the weight does not increase, and even if the plate thickness is made thin, the reinforcing protrusion prevents deformation and reduces the weight and There is an excellent effect that the material can be saved, and further, if the plate thickness is the same as the conventional one, the weight of the reinforcing rib material can be prevented from being deformed and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a concrete formwork of a conventional example.

FIG. 2 is likewise a perspective view showing a guide plate as a reinforcing rib member.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a perspective view showing a guide plate as a reinforcing rib material of the present invention.

5 is a cross-sectional view taken along line 5-5 of FIG.

6 is a sectional view taken along line 6-6 of FIG.

FIG. 7 is a plan view showing a method for manufacturing a guide plate.

FIG. 8 is a perspective view showing a concrete formwork.

FIG. 9 is a front view showing a concrete formwork.

FIG. 10 is a partial front view showing the action of the guide plate and the connecting pin.

FIG. 11 is a partial side view of the same.

FIG. 12 is a partial front view of the same.

FIG. 13 is a partial side view of the same.

FIG. 14 is a partial front view of the same.

[Explanation of symbols]

21 ... a guide plate as a reinforcing rib material, 22 ... a fixing portion,
23 ... Guide part, 23a ... Projection as bulge, 27 ...
Reinforcing protrusions, 28 ... Notches, 36 ... Reinforcing ribs as reinforcing rib materials, 50 ... Steel plate.

Claims (1)

[Claims] 1. In a reinforcing rib material for a concrete formwork, one side of which is formed by bending a steel plate and fixed to a formwork body, in a concave cut (2) from one side edge of the steel plate (50).
8), and a bulge (23) having a convex shape having the same shape as the cut (28) at the other side edge corresponding to this.
a) is formed, and at least one bent portion (aa) is provided between the inner edge of the cut (28) and the other side edge, and the bent portion (aa) and the other side edge are formed. A reinforcing rib material for a concrete formwork, characterized in that a reinforcing protrusion (27) is formed by stamping.