JPH0230578Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a plate for concrete formwork, and more specifically, when the plate for concrete formwork is made of metal, it is possible to attach concrete having nail legs. be.

When assembling slab formwork, inserts for ceiling suspension must be installed at predetermined intervals, but if the slab formwork is made of corrugated metal plates, installing the inserts is not easy. . That is, conventionally, concrete forms have been formed using thick plywood generally referred to as concrete panels, and inserts have been installed by nailing them into the concrete panels. However, since concrete panels are easy to cut, there is a strong tendency for them to be easily cut and wasted, and because they are not durable, they can only be used repeatedly. There was a desire for the appearance of a plate for frames, and in order to meet this demand, a practical application was made in 1983.
No. 96671, a plate for concrete formwork made of corrugated metal plates, has been developed and has been well received in the fields of civil engineering and architecture.

By using concrete formwork plates made of corrugated metal plates for slab formwork, the consumption of concrete formwork plates can be significantly reduced, and in terms of construction, new construction methods that eliminate joists can be used. Although this construction method can improve work efficiency, it has the disadvantage that it is impossible to drive inserts. Inserts currently on the market are originally intended for use with concrete panels, so they have nail legs that can be driven into and attached to the concrete panel. Even if an attempt is made to drive the nail into a metal concrete formwork plate, the nail leg does not have enough strength to punch through the metal plate.

Therefore, the present invention allows existing inserts to be attached to metal concrete formwork plates used in place of concrete panels by driving them. Three long holes or three holes, one of which is a circular hole, intersect with each vertex of an equilateral triangle of a predetermined size, respectively, in the horizontal part of a polymerizable metal corrugated plate arranged in parallel with each other. The reason is that groups of nail holes are drilled at appropriate intervals.

Next, one embodiment of the present invention will be described with reference to the drawings.

Part 1 showing the plate for concrete formwork of the present invention.
In the figure, 1 has a base of 35.2 mm and an opening at the top.
The keystone plate has valley lines 1a with an inverted trapezoidal cross section of 45.6 mm and height of 12.8 mm, and mountain lines 1b that are vertically symmetrical to the valley lines 1a. and oblique elongated holes 2, 2... whose inclination direction is symmetrical with respect to the horizontal center line,
Holes are drilled at equal intervals along the Also each mountain line 1b
(inner three rows in the example) has a radius of 10.00
mm Elongated holes 3a, 3a, 3 that intersect each vertex of an equilateral triangle inscribed in the circle C and are long in the tangential direction of the circle.
Nail hole group 3 consisting of a is drilled at intervals of 11.4 mm. The long hole 3a is inserted into the insert 4.
The width is such that it can barely prevent the nail leg 4a from passing through.

Since the concrete formwork plate 1 configured as described above can be polymerized, when forming a slab formwork, it is stepless in the direction of the striations and at every pitch of the striations in the direction perpendicular to the direction of the striations. By adjusting the displacement and overlapping, it is possible to cover almost the entire surface, and nail holes are formed in the overlapping part by the intersection of the long holes.
Therefore, the nail hole can be used to nail it to the main drawer. Therefore, the insert 4 is attached to the concrete formwork plate 1, and the nail hole group 3 consisting of the three long holes 3a as described above is drilled in the concrete formwork plate 1. has been,
The nail leg 4 of the insert 4 is inserted into the long hole 3a of the nail hole group 3.
If the nail legs 4a are applied and driven in, the nail legs 4a are driven into the elongated holes 3a like a wedge and are firmly attached. Usually, three nail legs 4a of the insert are provided so as to surround a circle at equal intervals, and each of the nail legs 4a of the insert is driven into the nail hole group 3 approximately at the center of the elongated hole 3a as shown in FIG. 3a. The position of the nail legs of the insert 4 has not been thoroughly standardized, and depending on the product, the spacing between the nail legs may be wide or narrow, and there may be some variation. Since the slot 3a is made up of a hole 3a, if the insert 4 is moved, each of the three nail legs 4a can be driven into the long hole 3a at a corresponding position. Also, some inserts have only two nail legs, in which case they can be driven in using two long holes, as shown in Figure 3b. When the insert 4 is installed and concrete 5 is poured, the insert 4 is buried in the concrete 5 (Fig. 4a), and by removing the concrete formwork plate 1, the surface of the concrete 5 is A screw hole 6 is exposed as shown in FIG. 4b, and a ceiling suspension member 7 can be screwed into the screw hole 6 to form a ceiling according to the conventional construction method.

In the concrete formwork plate of this embodiment, the nail hole group consists only of elongated holes in the tangential direction at each vertex of an equilateral triangle inscribed in a circle. A circular hole 3b is bored at one vertex of the contacting equilateral triangle, and a long hole 3a intersects with the other vertex.
is drilled long in the radial direction with respect to the circular hole,
As shown in the sixth figure, three long holes 3a, 3a, 3a,
Long holes can also be made radially from the center of the circle. In addition, diagonal long holes that form nail holes for fixing the concrete formwork in a large manner can be drilled only around the plate, or can be inclined in the same direction. Alternatively, a combination of a long hole and a circular hole, which are long in the direction of the striations, may be used. Note that it is effective to attach a transparent synthetic resin sheet to each strip to cover the perforation hole, since this prevents moisture from leaking.

As mentioned above, the plate for concrete formwork of the present invention is made of metal and has high durability, which greatly increases the number of times it can be reused.It is also difficult to cut, and because it is used after polymerization, it does not need to be cut. Because it can be combined into a desired shape, it is ideal for saving resources as it will not be cut carelessly and wasteful use will be avoided.Inserts conventionally manufactured for concrete panels Since it can be used in the same manner as the concrete panel, its practical benefits are great.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the plate for concrete formwork of the present invention, Fig. 2 is an explanatory diagram showing how to install the insert, and Fig. 3 a and b show the positional relationship between the nail hole group and the nail leg. Figures 4a and b are sectional views showing the insert buried in concrete, Figure 5 is a layout diagram showing the insert.
FIG. 6 and FIG. 6 are hole arrangement diagrams showing an example of a modification of the nail hole group. 1... Plate for concrete formwork, 1a... Valley line, 1b... Mountain line, 2... Diagonal long hole, 3... Nail hole group, 3a... Long hole, 3b... Round hole, 4 ...Insert, 5...Concrete, 6...Screw hole, 7
...Ceiling suspension member, C...circle.

Claims (1)

[Scope of utility model registration request] Three elongated holes or one of them is inserted into the horizontal part of a polymerizable metal corrugated plate, which is made up of alternating valleys and peaks, and intersects with each vertex of an equilateral triangle of a predetermined size. A plate for concrete formwork, characterized in that a group of nail holes, each consisting of a set of three holes, are bored at appropriate intervals.