JPH0235862Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is suitable for pouring concrete or mortar into in-situ casting frames for slope protection works, walls, vertical walls of waterways, walls of various buildings, etc. The present invention also relates to a paper form unit suitable for use in construction by spraying, and particularly to a paper form unit that can be unfolded and installed with one touch from a folded state and has anti-corrosion measures.

[Conventional technology] When constructing cast-in-place frames, retaining walls, etc. for slope protection works by pouring or spraying concrete or mortar, cardboard etc. are used because they can be provided at low cost and are lightweight and easy to handle. Paper formwork units came into use.

Conventionally, this type of paper formwork unit has placed a spacing member made of reinforcing bars between the paper formwork materials with their faces facing each other.
The bent part formed at the end of the reinforcing bar protrudes outward from the through hole drilled in the paper form material and is received by the receiving part, and a wedge is inserted into the outwardly protruding bent part to form the paper form. The material and the spacing material were fixed.

However, with such a structure, the paper form unit cannot be folded and has a bulky shape, making it inconvenient to transport to the site.
For this reason, it is not possible to use a paper formwork unit with spacing material arranged in advance, and the work of arranging the paper formwork materials on site and placing spacing material between them to form a formwork unit is not possible. Fixing work was required, resulting in poor workability.

Therefore, the present applicant developed a paper form that can be folded by pivotally connecting the reinforcing bars of the spacer to the paper form when reinforcing the spacing between the paper forms that face each other in advance. A proposal was made regarding the unit (1987-
Publication No. 80544).

According to this paper formwork unit, the formwork unit can be folded and is convenient for transportation, and there is no need to connect the paper formwork material and the spacing material on site, improving work efficiency. be able to.

However, although the previously proposed paper formwork unit had the above-mentioned advantages, it had the following drawbacks. In other words, reinforcing bars are usually used as spacing materials, and if these reinforcing bars are exposed to the surface of a concrete structure, rust will occur, causing deterioration of concrete strength and destruction, which is considered a major problem. Generally speaking, there should be no metal within 25mm of the surface. Therefore, when constructing using the paper formwork unit proposed earlier,
After the concrete has solidified, the reinforcing bars protruding from the concrete structure must be treated to prevent rust.

[Purpose of the invention] The present invention utilizes the feature of the previously proposed paper formwork unit, which allows the formwork to be unfolded and set in a folded state with a single touch, while also creating a paper formwork unit that solves the problem of rust. It was created for the purpose of providing formwork units.

[Structure of the invention] Therefore, according to the invention, a spacing member made of reinforcing bars is arranged between the paper form members whose surfaces face each other, and the end of the space maintainer is rotatable to the paper form member. In the paper form unit, which is connected to the paper form unit so that the paper form material can be installed from a folded state to an unfolded state, the paper form unit has a vertical bent portion at the tip of the reinforcing bar constituting the spacing material near the tip. A connecting tool made of synthetic resin, which includes a main body portion formed with a through hole into which the main body portion is inserted, a small diameter shaft portion integrated with the main body portion, and a retaining portion integrated with the small diameter shaft portion, and a paper formwork. A plurality of notches separated by a predetermined interval engage with the small diameter shaft portion between the paper form material and the retaining part of the connector when the connector is passed from the retaining part to the through hole drilled in the material. A paper formwork unit is provided having an elongated formwork reinforcement formed therein and having the function of securing the connector to the paper formwork material.

As a result, the paper formwork unit can be unfolded and set with one touch from the folded state, and the ends of the reinforcing bars placed between the paper formwork can be connected to the concrete structure using synthetic resin connectors. Since it is located deep inside the surface, it is not exposed to the surface and prevents rust from forming. Once the concrete has been poured and the concrete has hardened, remove the paper formwork and formwork reinforcing materials, but leave the connectors in place.

In carrying out the present invention, an iron bar having an arbitrary cross-sectional shape can be used as the reinforcing bar.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 and Fig. 2 show the entire structure of a paper formwork unit according to an embodiment of the present invention, in which a spacing member 2 made of reinforcing bars is arranged between paper formwork members 1 and 1 whose surfaces face each other. , the paper form materials 1 and 1 and the spacing material 2 are expanded and installed from the folded state shown in FIG. 2 to the state shown in FIG. connected in a way that makes it possible.

As shown in detail in FIG. 3, the spacing member 2 is made up of horizontal reinforcing bars 5 and vertical reinforcing bars 6, which are welded at their intersections and assembled in a cross-shaped structure. Both ends of the horizontal reinforcing bar 5 are vertically bent into an L-shape to form a bent portion 5a.

The formwork unit shown in FIG. 1 is provided with a connecting rod 7 that connects vertical reinforcing bars 6, 6 that are positioned diagonally in an expanded state. This fixes the formwork unit in the expanded state.

Details of the connector 3 are shown in FIGS. 6 and 7A to 7D. The connector 3 has a spacing member 2 near the tip.
A cone-shaped main body part 9 in which a through hole 8 is formed into which the tip vertical bent part 5a of the horizontal reinforcing bar 5 constituting the main body part 9 is inserted; a small diameter shaft part 10 integrated with the main body part 9; It is made of synthetic resin. In the illustrated example, the cone-shaped main body portion 9 has a truncated pyramid shape, but it may also have a truncated cone shape.

The formwork reinforcing material 4 is made of a long strip-shaped metal plate, as shown in FIGS. 1 and 2, and has notches 12 separated by a predetermined interval as shown in FIGS. 4 and 5. It is formed. This notch 12 is for engaging the small diameter portion 10 of the connector 3 and fixing the connector 3 to the paper form material 1, although details will be described later.

When assembling the paper form unit, first, as shown in FIG. 3, the through hole 8 of the connector 3 is inserted into the vertical bent portion 5a of the horizontal reinforcing bar 5 constituting the spacing member 2. Next, as shown in FIG.
The connecting tool 3 is passed from the retaining part 11 through the through hole 13 opened in the hole 13, and the notch 1 is formed in the formwork reinforcing material 4 at the small diameter shaft part 10 between the paper form material 1 and the retaining part 11 of the connecting tool 3.
2 to engage. Thereby, the paper form material 1 and the spacing material 2 are connected via the connecting tool 3.

At this time, since the tip vertical bent portion 5a of the horizontal reinforcing bar 5 constituting the spacing member 2 is inserted into the through hole 8 of the connector 3, the paper form unit shown in FIG. The paper form unit shown in FIG. 1 can be placed in an expanded state. Therefore, the paper form unit shown in Fig. 2 can be transported to the site in a folded and compact state, and the paper form unit shown in Fig. 1 can be easily unfolded and used at the site. Can be done.

Once the paper form units have been laid, concrete or mortar is cast or sprayed, and once the concrete or mortar has hardened, the form reinforcing material 4 and paper form material 1 are removed. The connector 3 is left as it is without being removed.

The tips of the reinforcing bars 5 constituting the spacing member 2 are positioned deep inside the concrete structure by a cone-shaped connector 3 made of synthetic resin so that they are not exposed to the surface of the concrete structure. Since it is sealed, rust does not occur, and the problem of deterioration and destruction of concrete structures due to rust is solved.

[Effects of the invention] As explained above, according to the invention, the paper formwork unit can be easily expanded from a folded state to a usable state, and therefore can be easily transported to the site. In addition, it is easy to assemble and install on-site, and work efficiency can be improved.
Further, since the reinforcing bars constituting the spacing member are not exposed on the surface of the concrete structure and are located inside the concrete structure, rust does not occur, and deterioration and destruction of the concrete structure due to rust is eliminated.

[Brief explanation of drawings]

1 and 2 show a paper formwork unit according to an embodiment of the present invention, FIG. 1 is a perspective view of the paper formwork unit in a state where it is unfolded and ready for installation, and FIG. 2 is a paper formwork unit in a state where it can be installed. FIG. 3 is a perspective view of the folded state. FIG. 3 is a perspective view showing the relationship between the spacing member and the connector. FIG. 4 is a partially enlarged plan view of the form reinforcement material. FIG. 5 is a cross-sectional view, partially shown in plan, showing how the connector is fixed to the paper form material. FIG. 6 is a perspective view showing details of the connector, and FIGS. 7A to 7D each show the connector, where A is a plan view, B is a side view, C is a front view, and D is a rear view. 1... Paper form material, 2... Spacing material, 3... Connector, 4... Form reinforcement material, 5... Horizontal reinforcing bar, 5a
... Vertical bent part, 6 ... Vertical reinforcing bar, 7 ... Connecting rod, 8 ... Through hole, 9 ... Cone-shaped main part, 1
0...Small diameter shaft part, 11... Removal prevention part, 12... Notch part, 13... Through hole.

Claims (1)

[Scope of utility model registration request] A state in which a spacing material made of reinforcing bars is arranged between paper form materials whose surfaces face each other, and the ends of the spacing material are rotatably connected to the paper form material, and the paper form material is folded. In a paper formwork unit that can be installed by being spread out from the main body, the paper formwork unit has a main body portion formed with a through hole near the tip into which the vertical bent portion of the tip of the reinforcing bar constituting the spacing material is inserted. A connecting tool made of synthetic resin consisting of a small-diameter shaft part integrated with the main body and a retaining part integrated with the small-diameter shaft part; A plurality of notches are formed at predetermined intervals to engage the small-diameter shaft portion between the paper form material and the retaining part of the connector when the connector is passed through the section, thereby fixing the connector to the paper form material. What is claimed is: 1. A paper formwork unit comprising: a long formwork reinforcing material having the function of