JPH0352909Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a simple type of concrete formwork device used in the construction of concrete structures such as legal frames and cloth foundations, and is particularly applicable to coastal areas. This makes it suitable for use in areas subject to salt damage.

[Conventional technology]

Conventionally, when constructing concrete structures such as legal frames and cloth foundations, lightweight and disposable formwork boards made of cardboard that has been treated with waterproofing and reinforcement treatment have been used, as shown in Utility Model Publication No. 59-29078. To connect these formwork plates to each other, a reinforcing bar separator with hooks on both ends is used, and the hooks are made to protrude outward from the formwork plates, and horizontal flaps, wedges, etc. are attached to the hooks. The method of inserting the mold and assembling the formwork has been implemented.
Therefore, in such formwork, after the poured concrete hardens and the formwork is removed, the hooks of the separator remain protruding from the concrete.
This protruding hook portion is either left as is or broken off.

[Problem that the invention attempts to solve]

Therefore, when constructing the above-mentioned concrete structure in a location prone to salt damage such as a coastal area, it is especially important to avoid corrosion of the separators that protrude from the concrete or whose broken parts are exposed on the outer surface of the concrete. Corrosion will progress rapidly and will have a negative impact on the concrete.

In order to improve these drawbacks, we changed the separator to one that uses a cone like in conventional formwork, and also used a particularly long cone to reduce the filling depth of the mortar after the cone was removed. It has also been proposed that the separator is made larger to prevent corrosion from reaching the separator. However, this method loses the advantage of simple formwork, which is easy and inexpensive to handle, and not only increases construction costs, but also causes the mortar filled in the cone removal area to peel off from the concrete over a long period of time. It has many disadvantages, such as cracking and cracking, which can lead to salt damage.

The present invention was made to eliminate the drawbacks of conventional formwork as described above. In particular, it uses a new material and structure for the separator, and after removing the formwork board, it can be The present invention aims to provide a simple formwork device suitable for constructing a structure without exposing or having the iron material of the separator in the area.

[Means for solving problems]

The structure of the formwork device of the present invention will be explained with reference to the drawings corresponding to the embodiments.The present invention has enlarged locking portions made of synthetic resin material at both ends, and the inner position of the enlarged locking portions. A separator formed by forming main rods formed by protruding formwork receiving pieces, vertically arranged in parallel at intervals, and integrally connected to each other by connecting rods;
A form plate provided with a through hole through which the enlarged locking part of the separator can be inserted, and a main rod of the separator on both sides between the enlarged lock part of the separator that protrudes from the through hole and the outer surface of the form plate. It is characterized by a two-pronged wedge rod that is inserted by pinching the rod.

〔Example〕

Hereinafter, embodiments of the formwork apparatus of the present invention will be described with reference to the drawings.

In Figures 1 to 4, 1 and 1 are formwork plates placed on the ground at required intervals and made of lightweight materials such as cardboard and plastic plates. The lower part is provided with through holes 2, 2 at required intervals for connection with a separator, which will be described later. They are arranged in rows at intervals of .

3 is a separator, and as shown in FIG. 3, enlarged heads 4, 4 that can be inserted into the through holes 2 are formed at both ends, and the receiving pieces 5, 5 of the formwork plate 1 are protruded into the inner positions of the enlarged heads 4, 4. Furthermore, reinforcing bar clamping bodies 6, 6 are installed at the inner position.
It has a structure in which two rods 7, 7 with protrusions are vertically arranged in parallel at an interval and connected together by connecting rods 8, 8. Then, this separator 3 inserts its enlarged heads 4, 4 into the through holes 2, 2 from the opposing surface side of the formwork plate 1, respectively, and brings the opposing surface of the formwork plate 1 into contact with the receiving pieces 5, 5. The forked wedge rod 10
The formwork plate 1 and the separator 3 are bonded together using.

As shown in FIG. 4, the forked wedge rod 10 has two
It is bent into a bifurcated shape with two leg rods 9, 9 facing each other, and the bent portion is wide. As shown in FIGS. 1, 2, and 4, a forked wedge rod is installed between the outer surface of the formwork plate 1 that is in contact with the receiving pieces 5, 5 and the enlarged head 2. If the pair of leg rods 9, 9 of 10 are inserted across both sides of the rod body 7, the formwork plates 1, 1 and the separator 3 will be connected via the forked wedge rods 10. It is.

The device of the present invention is constructed as described above, and assembles the formwork as shown in FIGS. Then, concrete 11 is poured between the assembled formwork plates 1 and 1. After the concrete hardens, the forked wedge rods 10, 10 are pulled out, and the form plates 1, 1 are peeled off and removed from the concrete 11. As shown in FIG. A structure in which the ends of the rods 7, 7 protrude will be constructed. Then, if the protruding ends of the rods 7, 7 are hit with a hammer or the like, the concrete 11, as shown by the chain line in the same figure, will be removed.
It can be broken off from the end face position.

5 to 7 each show other embodiments of the separator 3, and in the one shown in FIG. 5, the reinforcing bar clamping body 6 is placed in one central part of the rod body 7, and
The upper and lower rods 7, 7 are also connected by only a single connecting rod 8. 6 and 7, in place of the clamping body 6 in each of the previous embodiments, a connecting rod 8 is made to protrude long upward and downward from each rod body 7, 7, respectively. In this case, the reinforcing bars are attached by binding or the like along the intersection of the rod 7 and the connecting rod 8.

[Effect of idea]

As explained above, the formwork device of the present invention is formed by providing enlarged locking portions at both ends using a synthetic resin material and protruding formwork receiving pieces at inner positions of the enlarged locking portions. a separator formed by connecting main rods in parallel at intervals vertically and integrally connected to each other by connecting rods; a formwork plate provided with a through hole through which the enlarged locking portion of the separator can be inserted; and the through hole. It is constructed with a two-pronged wedge rod that is inserted between the enlarged locking part of the separator that protrudes further and the outer surface of the formwork plate, sandwiching the main rod of the separator from both sides, so it does not use the conventional threaded rod. The formwork can be assembled by simply inserting the ends of the separator rods into the formwork plate and removing the forked wedge rods without using separators with cones, making the work extremely simple and compared to conventional methods. The formwork can be constructed strongly without using batting material for reinforcing the formwork. In addition, the separator is made of synthetic resin and can be manufactured at a low cost that is suitable for mass production.The end of the main rod that protrudes from the concrete after the formwork is removed can be easily broken off from the outer surface of the concrete. The broken part and the separator as a whole will not be corroded, and there are many advantages such as completely preventing the corrosion of reinforcing bars in the concrete that arise from the separator part, especially those that are susceptible to salt damage. It is highly effective as a simple formwork for concrete structures constructed in easily accessible locations.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing one embodiment of the separator of the present invention, Fig. 2 is a cross-sectional view of the same part, Fig. 3 is an oblique view of the separator used in the device of the present invention, and Fig. 4 is the same bifurcated shape. The wedge rod slope diagram, FIG. 5, FIG. 6, and FIG. 7 are respectively slope diagrams showing other embodiments, and FIG. 8 is a longitudinal sectional view showing the constructed concrete structure. 1... Form board, 2... Through hole, 3... Separator, 4... Enlarged head, 5... Receiving piece, 6... Clamping body, 7... Rod, 8... Connecting rod, 9 ... Leg rod, 1
0...Forked wedge rod, 11...Concrete,
12... Main plot.

Claims (1)

[Scope of utility model registration request] Main rods made of synthetic resin are provided with enlarged locking portions at both ends and formwork receiving pieces are protruded from the inside of the enlarged locking portions, and are arranged in parallel at intervals vertically. a separator integrally joined by a connecting rod, a form plate having a through hole through which the enlarged locking part of the separator can be inserted, and the enlarged locking part of the separator and the formwork plate that protrude from the through hole. A simple formwork device consisting of a two-pronged wedge rod that is inserted between the outer surfaces of the separator, sandwiching the main rod of the separator from both sides.