JPS6320771Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a rib material for reinforcing concrete formwork.

(Prior Art) A conventional concrete formwork 1 for forming concrete for housing foundations will be explained with reference to FIG. The reinforcing frame 3 is bent in the direction opposite to the concrete molding surface 2a. A pair of square pipe-shaped connecting members 4 extending vertically are welded and fixed to both sides of the form body 2 on the side surfaces of the reinforcing frame 3, and the connecting members 4
A connecting hole 5 is transparently provided in. Further, a guide plate 6 as a reinforcing rib material is welded and fixed to the form body 2 facing one of the connecting members 4, and a guide hole 7 corresponding to the connecting hole 5 is transparently formed in the guide plate 6. has been done. A connecting rod 8a is inserted into the connecting hole 5 and the guide hole 7 so as to be rotatable and movable in the lateral direction.
A U-shaped clamping portion 8b is fixed to the connecting rod 8a, and the connecting rod 8a and the clamping portion 8b connect the connecting pin 8.
is configured. Note that three reinforcing ribs 9 are welded and fixed to the back surface of the form body 2.

The conventional guide plate 6 is shown in FIGS.
As shown in the figure, a long steel plate with straight side edges is bent to have an approximately L-shaped cross section, and a fixing part 10 for fixing it to the form body 2 and a connecting pin 8 are supported. A guide part 11 is formed for the fixing part 10.
A protrusion 12 for spot welding is formed by extruding outward, and a guide hole 7 is provided in the guide portion 11.

(Problems to be Solved by the Invention) However, the conventional guide plate described above has a structure in which a long steel plate with straight edges on both sides is simply bent into an L shape, and there is no problem in terms of saving materials. The problem was that the manufacturing cost was high due to lack of ingenuity.

The purpose of this invention is to provide a rib material for reinforcing concrete formwork, which can reduce weight and materials while maintaining strength.

Structure of the invention (Means for solving the problem) In order to achieve the above-mentioned purpose, this invention uses a reinforcing rib for concrete formwork, which is formed by bending a steel plate and fixes one side of the formwork to the main body of the formwork. A concave cut is formed from one side edge of the steel plate, and a convex bulge having the same shape as the cut is formed at the other side edge at a corresponding position, and the inner edge of the cut and the other side edge are formed. At least one bend is provided therebetween.

(Example) Hereinafter, an example that embodies this idea will be described in the fourth to fourth embodiments.
This will be explained according to FIG.

Figures 4 to 6 show a guide plate 21 as a reinforcing rib material, in which a vertically long (elongated) rectangular plate made of metal such as steel is bent in the vertical direction (longitudinal direction). The fixed part 22 and the guide part 23 are bent into a substantially L-shaped cross section along the bending line a-a, and are substantially perpendicular to each other.
is formed. The width of the guide portion 23 is approximately twice the width of the fixed portion 22, and the fixed portion 22 is stamped with protrusions 24 for spot welding, and the guide portion 23 is provided with guide holes 25. is transparent. A pair of grooves 26 (or one groove 26) is formed in the inner peripheral surface of the guide hole 25. Furthermore, a reinforcing protrusion 27 extending in the vertical direction is formed by stamping on the guide portion 23 between the folding line a-a and the guide hole 25.

At a position corresponding to the reinforcing protrusion 27, a notch 28 is made in the fixed part 22 from its side edge to the folding line a-a, thereby reducing the weight of the guide plate 21 and saving material while maintaining mechanical strength. We are trying to Therefore, the notch 28 forms a protrusion 22a.

Further, a notch 29 is made in the guide portion 23 from the side edge to the middle portion so as to leave the area around the guide hole 25 and the reinforcing protrusion 27, thereby reducing the weight of the guide plate 21 and saving the material. Therefore, this cut 29 forms a protrusion 23a as a bulge. In addition, in order to maintain the strength of the guide plate 21, the cut 29 needs to be formed so as not to reach the folding line a-a.

Now, the guide plate 21 configured as described above is manufactured as follows. As shown in FIG.
Cutting is performed sequentially along cutting line bb so that 23a is formed. Next, a guide hole 25 and a pair of grooves 26 are bored, and the reinforcing protrusion 27 and the protrusion 24 are formed while bending along the folding line a-a.
Therefore, the inner circumferential edge of the notch 28 and the outer circumferential edge of the protrusion 23a have the same shape, and the inner circumferential edge of the notch 29 and the outer circumferential edge of the protrusion 22a have the same shape, so that no material is wasted.

Further, in this embodiment, the portion where the guide portion 23 is easily deformed due to the notches 28 and 29 is replaced by the reinforcing protrusion 27.
Since the guide hole 25 and the surrounding portion thereof are reinforced by the guide hole 25, deformation and change in position can be prevented without increasing the plate thickness. Furthermore, since the reinforcing protrusions 27 are formed by stamping as described above, the weight does not increase due to the reinforcing protrusions 27.

Note that even if the plate thickness is made thinner, by providing the reinforcing protrusion 27, it is possible to reduce the weight and material while preventing deformation of the guide hole 25 and its surrounding area. Furthermore, if the plate thickness is the same as that of the conventional guide plate 21, the weight of the guide plate 21 remains the same and the effect of preventing deformation of the guide hole 25 and its surrounding area is improved.

Next, an example in which the guide plate 21 of this embodiment is used in a concrete formwork 30 will be explained with reference to FIGS. 8 to 14.

Flat concrete molding surface 31 made of steel plate
A reinforcing frame 32 is formed on the upper and lower edges of the formwork main body 31 having a shape 31a, which is bent toward the side opposite to the 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 surfaces of the reinforcing frame 32.
A connecting hole 34 is transparently provided in the connecting member 33 . Further, the guide plate 21 of this embodiment is attached to the fixing part 22 on the form body 31 facing one of the connecting members 33.
The guide hole 25 corresponds to the connecting hole 34, and the guide hole 25 corresponds to the connecting hole 34. Connection hole 3
4 and the guide hole 25, a connecting rod 35a is inserted and supported so as to be rotatable and movable in the lateral direction, and a U-shaped clamping portion 35b is fixedly attached to the connecting rod 35a. Further, the connecting rod 35a is provided with a protrusion 35c so as to be able to pass through the groove 26 of the guide hole 25, and the connecting pin 35 is constituted by the connecting rod 35a, the clamping portion 35b, and the protrusion 35c. Note that three reinforcing ribs 36 are welded and fixed to the back surface of the form body 31.

Now, in order to connect two concrete formworks 30 adjacently, as shown in FIG.
5a, and both connecting members 3 are connected by the clamping portion 35b.
Hold 3. Furthermore, the clamping portion 35b is connected to the connecting member 33.
After the connecting pin 35 is rotated clockwise in FIG. 11 so as to be released from the connecting rod 35, the connecting rod 35 is moved to the right as shown in FIG. 12, and the clamping state of both the connecting members 33 is released. In this case, the connecting rod 35a does not come out of the connecting hole 34 due to the contact between the protrusion 35c and the guide plate 21.

Furthermore, as shown in FIG.
Rotate the connecting pin 35 upward so as to lift it upward, and with the protrusion 35c placed in a position corresponding to the groove 26 of the guide hole 25, move the connecting pin 35 to the right as shown in FIG. When moved, the protrusion 35c passes through the groove 26 and the connecting rod 35a is removed from the connecting hole 34. Then, by moving the connecting pin 35 from this state to the front left, the connecting pin 35 can be separated from the concrete formwork 30. In this case, as shown in FIGS. 11 and 13, the guide hole 25 is smaller than the diameter of the connecting rod 35a.
There is no problem as the diameter is made large to allow for some margin. Also, connect the connecting pin 35 in the reverse order to that described above.
can be attached to the concrete formwork 30. Therefore, the damaged connecting pin 35 can be replaced.

A deforming force is applied to the guide plate 21 used in the above manner by operating the connecting pin 35. Further, as is well known, when concrete is poured, concrete pressure is applied to the concrete forming surface 31a, and this also applies deformation force to the guide plate 21. However, by providing the reinforcing protrusion 27 on the guide plate 21, the guide plate 21 becomes difficult to deform. Therefore, the life of the concrete formwork 30 is extended.

Note that it is considered most effective to provide the reinforcing protrusion 27 at an intermediate portion between the folding line a-a of the guide plate 21 and the guide hole 25; This should have the effect of preventing deformation of the hole 25. Further, a plurality of short reinforcing protrusions 27 may be arranged intermittently.

Effects of the device As detailed above, this device has a concave shape from one side edge of the steel plate in the reinforcing rib of a concrete formwork, which is formed by bending a steel plate and fixes one side to the formwork body. By forming a notch and forming a convex bulge having the same shape as the notch on the other side edge of the corresponding position, it is possible to reduce the weight and material while maintaining the strength of the reinforcing rib, It has an excellent effect of reducing manufacturing costs.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional examples, Figure 1 is a perspective view of a concrete formwork, Figure 2 is a perspective view showing a guide plate as a reinforcing rib, and Figure 3 is a
It is a sectional view taken along line -3. 4 to 14 show an embodiment embodying this invention, FIG. 4 is a perspective view showing a guide plate as a reinforcing rib, and FIG. 5 is a cross section taken along line 5-5 in FIG. 4. Figure 6 is a sectional view taken along line 6-6 in Figure 4, Figure 7 is a plan view showing the method of manufacturing the guide plate, Figure 8 is a perspective view showing the concrete formwork, and Figure 9 is the concrete mold. FIG. 10 is a front view showing the frame, 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, FIG. 12 is a partial front view, and FIG.
The figure is also a partial side view, and FIG. 14 is a partial front view. Guide plate 21 as reinforcing rib, fixed part 2
2. Guide portion 23, protrusion 23a as a bulge,
Cut depth 28, steel plate 50.

Claims (1)

[Claims for Utility Model Registration] 1. In a reinforcing rib of a concrete formwork, which is formed by bending a steel plate and fixing one side to the formwork body, a concave cut 28 is made from one side edge of the steel plate 50. A convex bulge 23a having the same shape as the notch 28 is formed on the other side edge of the corresponding position, and the notch 28 is
8. A reinforcing rib material for concrete formwork, characterized in that at least one bent portion a-a is provided between the inner edge and the other side edge. 2. The rib material for reinforcing concrete formwork according to claim 1, wherein a plurality of pairs of the notches 28 and the bulges 23a are provided.