JPH07166697A - Plastic-made concrete construction form - Google Patents

Abstract

PURPOSE:To prepare a plastic-made form which has excellent face strength and prevents the generation of strains or warping or the like. CONSTITUTION:This is a form where an outer peripheral wall 2 and reinforcing ribs 3 are installed to one side of a concrete contact wall 1. The concrete contact wall 1 having a hollow unit comprises an inside wall 1b on one side and an outside wall 1a on the other side. A proper number of recessed parts 7, which uses the outside wall as a bottom and are opened on the side of the inside wall, are further installed to the concrete contact wall. Or a proper number of inner ribs are installed to the hollow unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic formwork used for concrete construction in various constructions, civil engineering work and the like.

[0002]

2. Description of the Related Art In construction, civil engineering, and the like, as a formwork used for concrete construction, those made of wood or metal have been mainly used. Of these, the wooden formwork is
Its heavy use is one of the causes of excessive deforestation, and it is desirable not to use it as much as possible from the viewpoint of protecting the natural environment.

Further, the metal formwork has an extremely large weight as compared with a wooden formwork, which causes difficulties in transportation and handling during construction.

For the above reasons, in recent years, instead of wooden or metal molds, plastic molds, which have no problem of deforestation and can be reduced in weight, have been attracting attention, and their demand is increasing. As shown in Fig. 8 in which a part of the formwork is vertically cut away, the mainstream structure is simply a single plastic plate, in which the concrete contact wall 1 and other parts are entirely formed. Was weak, and strain and distortion were likely to occur.

[0005]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to propose a concrete construction form made of plastic, which has an excellent surface strength and which is unlikely to cause distortion or distortion.

[0006]

In order to solve the above problems, the plastic concrete construction form of the present invention employs the following technical means.

A formwork in which an outer peripheral wall and a reinforcing rib are provided on one side of a concrete contact wall, wherein the concrete contact wall is
Having a hollow portion, consisting of the inner wall on the one side and the outer wall on the other side, and further the outer wall to the concrete contact wall as the bottom,
A concave portion opened to the inner wall side is appropriately provided.

[0008] Alternatively, the concrete contact wall is a formwork having an outer peripheral wall and a reinforcing rib on one side, the concrete contact wall having a hollow portion, consisting of an outer wall and an inner wall, and further having an inner portion in the hollow portion. Ribs are provided as appropriate.

Further, the inner rib of the hollow portion is appropriately notched,
The hollow portions may be communicated. Further, a connecting hole penetrating the concrete contact wall may be appropriately provided.

[0010]

As a result of adopting the above means, the plastic concrete construction form of the present invention has the following actions.

The concrete contact wall has a double structure having a hollow portion and an outer wall and an inner wall. Further, a wall of the recess or an inner rib is interposed between the outer wall and the inner wall to contact the concrete. Since the wall is reinforced, the surface strength is excellent, strain and distortion are unlikely to occur, and the weight can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a plastic concrete construction form according to the present invention, in which the outside of the concrete contact wall 1, that is, the side in contact with the concrete faces downward, and the inside of the concrete contact wall 1 It is a figure of the state which turned up the side which does not contact concrete.

The concrete contact wall 1 is formed in a quadrangular shape, and has an outer peripheral wall 2 provided inside the concrete contact wall 1 along the circumference of the concrete contact wall 1 and a plurality of reinforcing ribs 3 arranged in parallel. Are provided substantially perpendicular to the concrete contact wall 1.

The outer peripheral wall 2 is appropriately provided with a connecting hole 4 for connecting a plurality of the molds, and the molds are overlapped with each other in accordance with the positions of the connecting holes 4 so that they can be connected to each other. The holes 4 are used to fix a plurality of molds with rivets or the like.

In practice, when performing concrete construction using this formwork, a plurality of formworks are installed so that the outer sides of the concrete contact wall 1 face each other, and a space between these formworks is provided via a separator. Keep a constant interval.
Then, concrete is poured between the formwork. For attaching the separator, the concrete contact wall 1 is appropriately provided with a separator attachment hole 5 penetrating the concrete contact wall 1.

FIG. 2 is a sectional view taken along the line AA of FIG. 1, showing a cross section of a concrete contact wall 1 extending in the vertical direction, an outer peripheral wall 2 extending in the horizontal direction, and a reinforcing rib 3.

As shown in this figure, the concrete contact wall 1
A hollow portion 6 is formed in the concrete contact wall 1
Has a double structure of an outer wall 1a on the outer side and an inner wall 1b on the inner side. The hollow portion 6 is formed by a known plastic molding method in which compressed air is sent while the core die is retracted, and the space created by the movement of the core die is the hollow portion 6.

When the hollow portion 6 is formed, the outer wall 1a is used as a bottom portion, and the concave portion 7 opening to the inner wall 1b side is appropriately formed. The recess 7 is seen as a depression on the inner wall 1b in FIG. 1, and in FIG. 2 showing a cross section, it can be seen that the cylindrical wall communicates with the outer wall 1a and the inner wall 1b.

Alternatively, instead of the recess 7, the inner rib 8 may be formed in the hollow portion 6. When this inner rib 8 is formed, the state where the inside of the concrete contact wall 1 is directed upward is as shown in FIG. FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3, in which the inner rib 8 is formed at right angles to the concrete contact wall 1 and parallel to the reinforcing rib 3, and the wall 1a and the inner wall
I am trying to connect with 1b. In the known plastic molding method for forming the hollow portion 6,
It is easier to manufacture the inner ribs 8 by appropriately forming notches so that the hollow portions 6 communicate with each other.

The separator mounting hole 5 passes through the hollow portion 6 and penetrates the outer wall 1a and the inner wall 1b of the concrete contact wall 1. The cross-sectional shape of the separator mounting hole 5 may be formed such that the portion with which the head of the separator abuts is large as shown in FIG. 5, or it may be substantially cylindrical as shown in FIG.

As described above, by forming the hollow portion 6 in the concrete contact wall 1, the concrete contact wall 1 has a double structure of the outer wall 1a and the inner wall 1b. The surface strength is excellent and distortion and distortion are less likely to occur as compared with a plastic mold having Further, if the concrete contact wall 1 has the same thickness, it can be made lighter. Moreover,
The wall of the recess 7 or the inner rib 8 is interposed between the outer wall 1a and the inner wall 1b to increase the surface strength of the concrete contact wall 1 and resist the force applied to the concrete contact wall 1 at right angles. It also plays a role in preventing damage to the formwork.

The reinforcing ribs 3 may be provided in a grid shape as shown in FIG. 7, or may be provided as appropriate, in addition to being provided in parallel as in the above-described embodiment.

[0024]

The present invention has the above-mentioned structure and has the following effects.

In the plastic concrete construction form of the present invention, the concrete contact wall has a double structure consisting of an outer wall and an inner wall, and the concrete contact wall is reinforced by the recesses or the inner ribs. Since it is excellent in strength, is less likely to cause distortion and distortion, and can be made lightweight, it is possible to facilitate concrete construction work and handling during transportation.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a plastic concrete construction form of the present invention in which a concrete contact wall is provided with a recess.

2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of an embodiment of a plastic concrete construction form of the present invention in which an inner rib is provided on a concrete contact wall.

4 is a sectional view taken along line AA of FIG.

FIG. 5 is a sectional view of a separator mounting hole.

FIG. 6 is a cross-sectional view of a cylindrical separator mounting hole.

FIG. 7 is a perspective view of another embodiment of the plastic concrete construction form of the present invention.

FIG. 8 is a perspective view of a conventional plastic concrete construction form with a part cut away to show a cross section.

[Explanation of symbols]

 1 Contact Wall 1a Outer Wall 1b Inner Wall 2 Outer Wall 3 Reinforcing Rib 6 Hollow 7 Recess 8 Inner Rib

Claims (4)

[Claims] 1. A formwork in which an outer peripheral wall and a reinforcing rib are provided on one side of a concrete contact wall, wherein the concrete contact wall has a hollow portion and is formed from an inner wall on the one side and an outer wall on the other side. A concrete formwork for concrete construction, characterized in that the concrete contact wall has an outer wall as a bottom portion and a concave portion opening to the inner wall side is appropriately provided. 2. A formwork in which an outer peripheral wall and a reinforcing rib are provided on one side of a concrete contact wall, wherein the concrete contact wall has a hollow portion, an outer wall and an inner wall, and the hollow portion further includes an inner wall. A formwork for concrete construction made of plastic, which is provided with ribs appropriately. 3. The mold for concrete construction made of plastic according to claim 2, wherein the inner rib of the hollow portion is appropriately notched so that the hollow portions are communicated with each other. 4. The plastic concrete construction form according to claim 1, wherein a connecting hole penetrating the concrete contact wall is appropriately provided.