JPH0740906U - Concrete formwork connection fittings - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to facilitate the connection of two connecting rods for connecting concrete formwork and to easily attach the connecting rod to the formwork. [Structure] Two connecting rods 3 each having a long hole 2 at a symmetrical position with respect to a bending line of a thin steel plate 1 which is elastically deformed into a substantially V-shaped cross section and having a threaded portion 3a and a washer 8 at an outer end. The inner end side of is inserted into the two elongated holes 2 of the thin steel plate 1 that is bent into a substantially V-shaped cross section. Then, by restoring the bent state of the thin steel plate 1 to the original state, the restoring elastic force of the thin steel plate 1 causes the two connecting rods 3 to be crimped at the peripheral edge of the elongated hole 2 to be in the connected state. With this washer 8 at the outer ends of both of the connecting rods 3 and a nut screwed into the threaded portion 3a, the two concrete formwork can be held at a constant interval.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a metal fitting for connecting a formwork connecting rod that supports a formwork used during concrete construction.

[0002]

[Prior art]

 Plywood is often used as a formwork for concrete construction at construction sites because of its good quality, strength, durability and economy. This plywood formwork is used by applying a release material such as oil to the formwork surface, but in order to further improve durability, releasability, and beauty of the surface finish, the formwork surface can be coated with a synthetic resin or a synthetic resin plate. It is done by pasting. When a synthetic resin is used on the surface of the mold, it has good releasability, so it is possible to give a decorative pattern to the resin surface, and it is possible to use it without leaving a concrete wall without special finishing. In addition, the concrete formwork maintains the space between the formworks set up facing each other, and the formwork connecting rods that oppose the lateral pressure of concrete applied to the formwork are installed in the holes formed at symmetrical positions of the left and right formwork. Through, a washer and a nut are provided on the outer end of the connecting rod to support the form frame. However, it is difficult to open the left and right holes at exactly symmetrical positions, and in order to compensate for some deviation between the left and right holes, two connecting rods 11 are separately passed through the left and right holes as shown in FIG. , The overlapping portions C of the connecting rods are welded to connect the two connecting rods 11, and the washer 12 and the nut 13 provided at the outer ends of the connecting rods sandwich and support the two formwork 10. There is.

[0003]

[Problems to be solved by the device]

 However, when welding the overlapping parts of the two connecting rods as described above, when a synthetic resin plate for pattern formation is placed inside the formwork, sparks that occur during welding are generated on the formwork surface. The scattering causes the synthetic resin in the portion hit by the sparks to be burnt or burnt, so that there is a disadvantage that a predetermined pattern cannot be formed. In addition, welding requires special equipment and is labor-intensive, and the work must be done between the two molds, resulting in poor workability. Therefore, in the connection tool of the concrete formwork of the present invention, a fitting for crimping the end of each connection rod is provided in the portion where the two connection rods are overlapped to facilitate the connection of the two connection rods. The purpose is to make it easy to attach the connecting rod to the formwork.

[0004]

[Means for Solving the Problems]

 The connection tool for concrete formwork of the present invention solves the above-mentioned problems, and is a connection tool for connecting and holding two concrete formwork at a constant interval for constructing concrete walls or the like. The two inner ends of the two connecting rods, each of which has a long hole in the symmetrical position with respect to the bending line of the thin steel plate that is elastically deformed, and has a retaining member for the concrete formwork at the outer end, have a substantially V-shaped cross section. The two connecting rods were inserted into the two long holes of the bent thin steel plate and pressed by the elastic force of the thin steel plate so that the two connecting rods were connected so as not to separate. Also, by bending both ends of the thin steel sheet and using it as a grip portion when bending the thin steel sheet, the bending of the thin steel sheet was facilitated. Furthermore, the thin steel plate was made of spring steel having a large elastic force, and the force for crimping the connecting rod was increased.

[0005]

[Action]

 When two concrete formwork are connected by the concrete formwork connecting metal fitting of the present invention, a force is applied to the thin steel plate to bend it into a substantially V-shaped cross section, which is at a symmetrical position with respect to the bending line of the thin steel plate. If two connecting rods are passed through one long hole and the force applied to the thin steel plate is removed, the restoring elastic force of the thin steel plate pushes the two connecting rods at the periphery of each long hole to crimp the connecting rod. State. The retaining members at the outer ends of both connecting rods can then be adjusted to hold the two concrete forms at regular intervals. Further, when both ends of the thin steel plate are bent, the thin steel plate can be bent by gripping the portions to have a substantially V-shaped cross section, and the thin steel plate can be easily bent.

[0006]

【Example】

 An embodiment of the concrete metal fitting of the present invention will be described with reference to FIGS. The thin steel plate 1 of the connecting fitting is formed into a rectangular shape, for example, by spring steel having a large elasticity, and is elastically deformed into a substantially V-shaped cross section with the bending line near the center, and it is located at two symmetrical positions with respect to the bending line. The long hole 2 is opened. The two long holes 2 hold both ends of the thin steel plate 1 and apply a little inward force to bend them into a V-shaped cross section so that the two connecting rods 3 to be described later communicate with the two long holes 2. It has become. Then, by stopping the application of the bending force of the thin steel plate 1, the bent state of the thin steel plate 1 is restored, and the elastic force of the thin steel plate 1 causes the two long holes 2 communicated with the two elongated holes 2. The connecting rod is strongly pressed at the peripheral edge of the long hole 2 so that the connecting rod 3 is in a connected state. In this embodiment, both longitudinal ends of the elongated hole 2 are formed in a semi-circular shape, but they may be formed in other V-shapes or polygonal shapes. The thin steel plate 1 is preferably rectangular, but is not limited to that shape. Each of the two connecting rods 3 has a threaded portion 3a at the outer end thereof, and the inner ends of the respective connecting rods 3 are passed through the two elongated holes 2 of the thin steel plate 1 and crimped. The connecting state is established by means of and a retaining member is provided at the outer end. The retaining member of this embodiment has a structure in which a threaded portion 3a is provided at the outer end of each connecting rod 3, a washer 8 is provided at the inner end thereof, and a nut is screwed into the threaded portion 3a. This retaining member supports the concrete formwork to maintain the space between the formwork and resist the lateral pressure of the concrete.

When two connecting rods 3 were connected to each other in the connecting metal fitting configured as described above, and both ends of the connecting rod 3 were pulled to perform a tensile strength test, each connecting rod 3 had a diameter of 8 mm. It was found that when a round bar steel material was used, it had a tensile strength of about 500 kg / piece. This was larger than the tensile strength of about 400 kg / 1 piece when two connecting rods having the same thickness were connected by welding. Therefore, when the concrete formwork is connected at a constant interval using the connecting fittings in which the two connecting rods 3 are connected by the thin steel plate 1, the connecting rods 1 are connected more than when connecting the two connecting rods by welding. Since the power to support the formwork per group is strong, the number of connecting rods provided on the entire formwork can be reduced. Both ends of the thin steel plate 1 are bent into a substantially semicircular cross section to form a grip portion 1a, and when the connecting rod 3 is passed through the two elongated holes 2 of the thin steel plate 1, both grip portions 1a are formed. The thin steel plate 1 can be bent while holding a, and the length of the connecting rod can be easily adjusted and detached when the connecting rod is in the connected state. It should be noted that the both ends of the thin steel plate 1 are not limited to the substantially semicircular cross section, and may be bent into other cross sections to easily apply force.

When the two concrete forms are held at a constant interval by using the connecting fitting of the present invention, as shown in FIG. 3, the two concrete forms 5 placed facing each other are located at substantially symmetrical positions. The synthetic resin makeup placed inside the concrete formwork 5 through which the threaded portions 3a at both ends of the two connecting rods 3 connected by the thin steel plate 1 penetrate through the holes provided in The washer 8 contacts the inner surface of the mold 6. At this time, the length of the two connecting rods 3 connected to each other can be easily adjusted by bending the thin steel plate 1 because the pressure-bonded state of the two connecting rods 3 is loosened. Then, by attaching and fixing the nut 7 to the threaded portion 3a of the connecting rod 3 protruding to the outside of the concrete form 5, the two concrete forms 5 can be supported at a constant interval. The connecting fitting is embedded in the concrete after the concrete is cast between the two concrete formwork 5. In the above embodiment, the connecting metal fittings were used for connecting the concrete formwork, but the same can be applied to the case where two members other than the concrete formwork are connected by adjusting the length.

[0009]

[Effect of device]

 By using the concrete metal fittings of the present invention, the lengths of the two connecting rods can be easily adjusted, and the elastic force of the thin steel plate can bring the two connecting rods into a connected state. The work of holding a single concrete formwork at fixed intervals with connecting metal fittings is simple, and formwork construction can be performed efficiently. Also, the attachment of the connecting rod to the concrete formwork does not burn the decorative formwork unlike when welding, and even if you are not a professional, you can easily work and no special equipment is required, so welding is not necessary. It is economical because it saves the time and cost required.

[Brief description of drawings]

FIG. 1 is a perspective view of a thin steel plate of a connecting fitting of a concrete formwork of the present invention.

FIG. 2 is a plan view (a) and a front view (b) of a concrete formwork connecting fitting of the present invention.

FIG. 3 is a perspective view of the concrete formwork connecting fitting of the present invention used to hold the formwork.

FIG. 4 is a front view showing a conventional example.

[Explanation of symbols]

 1 Thin steel plate 2 Long hole 3 Connecting rod

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Motoaki Hirakubo 35-1 Kishine-cho, Kohoku-ku, Yokohama-shi, Kanagawa Stock Company Coral

Claims (3)

[Scope of utility model registration request] 1. A connecting fitting for connecting and holding two concrete formwork at a constant interval for constructing a concrete wall or the like, the position being symmetrical with respect to a bending line of a thin steel plate elastically deformed into a substantially V-shaped cross section. Each of the two connecting rods having a long hole in each of them and having a retaining member for the concrete formwork at the outer end is formed of a thin steel plate in which the inner end side is bent into a substantially V-shaped cross section.
A connecting tool for concrete formwork, which is inserted into one long hole and crimps two connecting rods by the elastic force of a thin steel plate. 2. The connecting fitting for the concrete formwork according to claim 1, wherein both ends of the thin steel plate are bent to form a grip portion when the thin steel plate is bent. 3. The thin steel sheet is spring steel.
Concrete connection metal fittings.