JPH0260819B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a formwork for constructing a concrete floor.

The present inventor originally invented Patent Application No. 167084 (Japanese Unexamined Patent Publication No. 167089655) in 1972, which brought great benefits to the construction of concrete floors, but the present invention further improves this invention. The object of the present invention is to obtain a formwork that can significantly reduce the "cross-sectional loss of concrete beams" which is a drawback of the above-mentioned invention.

Embodiments of the invention will be described with reference to the drawings.

In the figure, reference numeral 1 denotes the formwork of the first embodiment, and the formwork 1 is approximately rectangular and has a required area, and both side walls 3, 3 that expand downward on the lower surface side of the horizontal plate 2. reinforcing ribs 5, 5 having a triangular cross section and consisting of a bottom surface 4 and a bottom surface 4;
A required number of... are arranged in parallel and bent, and at the apex of the triangular reinforcing rib 5, the tops of the both side walls 3, 3 come into contact with each other to form a closed apex 13. . As shown in the figure, the connecting piece 6 is folded down on one side parallel to the reinforcing rib 5. 7
is a hook part formed over the required width W at both ends of the formwork 1, and the end part of the bottom face 4 of the reinforcing rib is crushed with a press machine, and the tip part 8 is attached to the back surface of the horizontal plate 2. to form a slope 10 that connects to the bottom surface 4 of the reinforcing rib following the rear side 9 of the foremost part 8, and also connects the connecting piece 6.
An inclined side 11 having the same degree of inclination as the inclined surface 10 starting from the rear side 9 of the hooking part 7 is formed by cutting the end portion of the holding part 7. FIG. 7 shows a third embodiment. This is because when the total length of the formwork in the first embodiment is longer than a certain level, when supporting it with the concrete beam A, it is better to also support it in the center. As an improvement to the example,
In the case of a formwork with a long overall length, the above-mentioned hooking part 7 is installed in the center part.
A recessed portion 12 having substantially the same shape as the recessed portion 12 is formed. As shown in FIG. 7, a rectangular shape with a required width H' and a required length L' is placed in the intermediate flat part 14' between the reinforcing ribs 5 in the concave part 12 of the formwork 1''. Drill a cutout window 15' (other than this point,
(same as that of the first embodiment shown in the figure).

FIG. 6 shows the third embodiment placed on concrete beams A and A. As shown in FIG. 8, the formwork 1 of the first embodiment is constructed by placing the hanging parts 7 directly on the upper surface of the concrete beam A, and connecting pieces 6 of the adjacent formworks are A large number of formworks are laid by fitting into the gaps between the outer reinforcing ribs 5,
A reinforced concrete floor slab 17 is constructed on this upper surface.

As shown in FIGS. 1 and 2, in the hooking portion 7, an intermediate flat portion 14 is formed between the foremost portions 8 and 8 of the reinforcing rib 5, which have crushed the end portions of the bottom surface 4. A rectangular notch 15 (concrete continuity notch for making the concrete in the upper part of the formwork 1 and the concrete in the lower part continuous with each other when constructing the concrete floor) with the required width H and the required length L is made. to drill.

In FIG. 3, 1' is the formwork of the second embodiment, which has side walls 3', 3' and a bottom surface 4' that expand downward on the lower surface side of the approximately square horizontal plate 2'. A required number of reinforcing ribs 5', 5', each having a triangular cross-section, are bent in parallel to each other, and at the apex of the triangular reinforcing ribs 5', the side walls 3', 3' are bent. The top portions are brought into contact with each other to form a closed top portion 13'. As shown in the figure, the connecting piece 6' is folded down on one side parallel to the reinforcing rib 5'. Reference numeral 7' denotes a hooking part formed over the required width W' at both ends of the formwork 1', and is attached to a press machine from both sides of the surface of the horizontal plate 2' and the bottom surface 4' of the reinforcing rib 5'. It is crushed and formed horizontally in the middle part of both sides.
Reference numeral 8' denotes a slope that connects the rear side of the hooking portion 7' with the horizontal plate 2' and the bottom surface 4' of the reinforcing rib 5'. Reference numeral 9' denotes a notch, which is formed by cutting both ends of the connecting piece 6' over a length approximately equal to that of the hooking part 7' and the slope 8'. FIG. 10 shows a fourth embodiment. This is because when the total length of the formwork in the second embodiment is longer than a certain extent, it is better to support it at the center of the concrete beam A when it is supported by the concrete beam A. As a major improvement, in the case of a formwork with a long overall length, the above-mentioned hooking part 7' is added to the center part.
A recessed portion 12' having substantially the same shape as the recessed portion 12' is formed. As shown in FIG. 10, in the concave part 12' of the formwork 1, a rectangular cutout window 15 with a required width H and a required length L is provided in the intermediate flat part 14 between the reinforcing ribs 5' and 5'. (Other than this point, it is similar to the second embodiment shown in FIG. 3).

FIG. 9 shows a state in which the formwork 1 of the fourth embodiment is placed on concrete beams A, A.
As shown in FIG. 8, the formwork 1' of the second embodiment is
The hanging part 7' is placed directly on the upper surface of the concrete beam A.

When constructing a floor slab having a step in a part using the formwork of the present invention, as illustrated in FIG. In the area 19 where the floor slab is to be thickened, there is a mold in which the reinforcing ribs 5 are crushed toward the horizontal plate 2 to form a hook 7 that is parallel to the horizontal plate 2, as shown in the first embodiment. A frame 1 is laid, and concrete 17 is cast on the upper surface of the formwork to form a floor slab with a flat surface.

As shown in FIG. 3, at the hooking part 7',
A rectangular notch 15'' having a required width H and a required length L is bored in the intermediate flat portion 14'' between the crushed end portions of the reinforcing ribs 5'. As mentioned above, when constructing a concrete floor, the notches 15 and 15'' are drilled near the hooks 7 and 7' (when constructing a concrete floor, the concrete in the upper part of the formwork 1 and the concrete in the lower part Formwork 1, 1'
The concrete in the upper part and the lower part are continuous, and in consideration of the width of the upper surface part of the concrete beam A on which the hanging parts 7, 7' are placed, the notches 15, 15'' For this reason, the width H of the notches 15, 15'' may be larger than the widths W, W' of the hooks 7, 7'.

FIG. 11 is a perspective view showing the end of the formwork 1 placed on a concrete beam A in order to explain the effects of the present invention.

In the invention invented by the present inventor in Japanese Patent Application No. 167084/1984 (Published Patent Application No. 89655/1989), when the end of the formwork is placed on a concrete beam, it is necessary to However, in the present invention, there was an unavoidable problem that there is a "cross-sectional defect in the concrete beam" over the entire length where the end part contacts the concrete beam. is the notch 15 (or 15'', or the notch window 15',
Due to the presence of 15), when constructing a concrete floor, the concrete in the upper and lower parts of the formwork 1 is continuous at the cutout (or cutout window) to form a concrete floor. In the figure, 23 is a reinforcing bar.

In the present invention, as described above, a required number of reinforcing ribs 5, 5... each having a triangular cross section and consisting of both side walls 3, 3 expanding downward and the bottom surface 4 are arranged in parallel to each other on the lower surface side of the horizontal plate 2. In a formwork in which the reinforcing ribs 5 are bent, and at the apex of the triangular reinforcing ribs 5, the top portions of the side walls 3, 3 are brought into contact with each other to form a closed apex portion 13, the reinforcing ribs are bent. 5 is crushed with a press machine, and the foremost part 8 is overlapped with the back surface of the horizontal plate 2 to form a hooking portion 7, and the hooking portion 7 is
Nearby, in the intermediate flat area between the topmost parts 8 and 8 of the reinforcing rib 5 where the end of the bottom surface 4 has been crushed, "the concrete in the upper part of the formwork and the concrete in the lower part are continuous". Either cut out ``15'' for concrete continuity, or use a press machine to cut both ends of the formwork 1' from both the surface of the horizontal plate 2' and the bottom surface of the reinforcing rib 5'. A hooking portion 7' of a required width is formed at the intermediate portion of both sides by pressing and dipping, and in the vicinity of the hooking portion 7', an intermediate flat portion is formed between the pressed portion and the portion where the end of the reinforcing rib 5' is pressed. A concrete continuity notch 15'' is drilled in the support section 14'' so that the concrete in the upper part of the formwork and the concrete in the lower part are continuous with each other.
Formworks 1 and 1' are formed so that the concrete in the upper part and the lower part is continuous to form a concrete floor.
Since the hooking parts 7 and 7' are suspended horizontally on the beam and concrete is poured into the beam, "section defects in the concrete beam" are significantly reduced, which is useful for improving the strength of reinforced concrete buildings. Furthermore, when attaching the ends of the formwork 1 to the temporary frame 21 (wooden formwork) as shown in Fig. 12, conventional methods require drilling holes in the ends of the formwork and then nailing them. However, in the method of the present invention, as shown in FIG.
Formwork 1 can be attached to temporary frame 21 by simply driving 2 into the corner of notch 15 and bending it.
There is also a big effect that it is extremely advantageous in field work.

[Brief explanation of the drawing]

The drawings show examples of the formwork for constructing concrete floors according to the present invention, and FIG. 1 is a partially cutaway perspective view of the formwork of the first embodiment, and FIG. 2 is a perspective view of the formwork of the first embodiment. FIG. 3 is a perspective view of the formwork of the second embodiment with a portion cut away, FIG. 4 is a side view of the same as above, and FIG. 5 is an A-A view of the formwork of FIG. 1. 6 is a side view showing the formwork of the third embodiment bridged over a concrete beam, FIG. 7 is a plan view of the same formwork, and FIG. 9 is a cross-sectional view showing the formwork of the second embodiment bridged over a concrete beam and concrete is poured; FIG. 9 is a side view of the formwork of the fourth embodiment bridged over a concrete beam; FIG. The figure is a plan view of the formwork of the fourth embodiment, and FIGS. 11 and 12 are perspective views for explaining the effects of the present invention. 1, 1', 1'', 1 is the formwork, 2, 2' is the horizontal board,
3, 3' are side walls, 4, 4' are bottom surfaces, 5, 5' are reinforcing ribs, 6, 6' are connecting pieces, 7, 7' are hanging parts, 8 is the foremost part, 8' is a slope, 9 is the rear side, 9' is the notch, 1
0 is a slope, 11 is an inclined side, 12, 12' is a concave part,
13, 13' are closed apex parts, 14, 14', 14'',
14 is the intermediate flat part, 15, 15'' is the notch part, 1
5', 15 are cutout windows, 17 is concrete, 1
8 is a thin part, 19 is a thick part, 20 is a stirrup, and 21 is a wooden formwork (temporary frame).

Claims (1)

[Scope of Claims] 1. A required number of reinforcing ribs each having a triangular cross section and consisting of both side walls expanding downward and a bottom surface on the lower surface side of the horizontal plate.
In the formwork, the reinforcing ribs are bent in parallel to each other, and the tops of the both side walls are brought into contact with each other at the apex of the triangular reinforcing rib to form a closed apex. The end of the bottom surface is crushed using a press machine, and the foremost part is overlapped with the back surface of the horizontal plate to form a hooking section, and the end of the bottom surface of the reinforcing rib is pressed near the hooking section. A concrete continuity notch is bored in the intermediate flat part between the crushed top part and the concrete in the upper part of the formwork to make the concrete in the lower part continuous with each other. Formwork for concrete floor construction. 2. Install the required number of reinforcing ribs with a triangular cross section on the bottom side of the horizontal plate, consisting of both side walls that expand downward and the bottom surface.
In a formwork which is bent in parallel to each other, and in which the tops of the side walls are brought into contact with each other at the apex of the triangular reinforcing rib to form a closed apex, both ends of the formwork are bent. is crushed using a press machine from both the surface of the horizontal plate and the bottom surface of the reinforcing rib to form a hooking part of the required width in the middle part of both sides, and the reinforcing rib is crushed in the vicinity of the hooking part. A notch for continuous concrete is drilled in the intermediate flat part between the crushed end of the formwork and the concrete in the upper part of the formwork and the concrete in the lower part. Characteristic formwork for concrete floor construction.