JP3063665U - Connecting metal fittings for concrete formwork - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a connecting metal fitting which ensures roundness of a cone portion, has no eccentricity of a screw hole, and can be easily collected without causing damage during disassembly. SOLUTION: A plate-shaped portion 11 having a pin hole 12 provided in the vicinity of a center and a screw hole 16 connected to the plate-shaped portion and having an end portion into which a separator is screwed.
And a resin-made cone 2 having a hollow large-diameter side.
Is screwed into the rod 13 with the large diameter side facing the plate 11.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a concrete formwork fitting for connecting formwork arranged on both sides of a wall in concrete wall construction.

[0002]

[Prior art]

 For example, when constructing a reinforced concrete wall, formwork arranged in panels is placed on both sides of the wall, and the formwork on both sides is connected by a separator and the concrete is cast while maintaining the spacing. Have been done. This will be described with reference to FIG. FIG. 5 is a conceptual cross-sectional view showing a part of a concrete wall to be cast. Formwork 3a, 3b arranged on both sides of the wall is connected by a separator 5 via a connecting fitting 4 to maintain an interval. In this state, concrete C is cast inside the formwork 3a, 3b. Reference numeral 6 denotes a clip for inserting the adjacent formwork and connecting metal fitting. A pin or a bolt may be used instead of the clip 6.

FIG. 6 shows an example of the connection fitting 4 described in JP-A-7-259327. This connecting metal fitting 4 is composed of a flat plate-like portion 41 (this portion is sometimes called a blade or an oval at a construction site) and a cone portion 43 integrally connected to one end thereof. A pin hole 42 is formed in the vicinity of the center, and a screw hole 44 is formed in the end face of the cone portion 43.

As shown in FIG. 5, when used, a clip 6 is inserted into the pin hole 42 so as to overlap a connection hole provided in a flange of the adjacent formwork 3, and the separator 5 is inserted into the screw hole 44. Screwed. After the concrete C is hardened, the form 3 is dismantled, and the connection fitting 4 is removed and collected, but the separator 5 is left in the concrete C. The manufacturing process of the connection fitting 4 will be described with reference to FIG. 4a in (a) is a round steel rod made of a material. This is put into a heating furnace and heated, and is turned sideways as shown in FIG. 4b shows the shape after primary forging. Although the approximate shape is completed with this, the primary forging alone makes it difficult for the perfect circle of the cone part to come out due to misalignment of the upper and lower molds, and the right-angled surface of the upper and lower neck part tends to be stepped, etc. As shown in (c), the material 4c is oriented vertically and a process called upsetting forging is performed to correct the unevenness of the right-angled surface of the lower part of the neck and the squareness of the plate-shaped part with respect to the cone to finish the outer shape. Is common. Thereafter, the pin hole 42 is punched out, and the screw hole 44 is machined.

[0005] Although upset forging corrects the level difference in the right-angled surface of the lower part of the neck, the material flows internally between the plate-shaped portion and the cone portion during this forging, and the boundary portion is constricted (unsatisfactory). Part) may occur, and there is a problem that it is easily damaged during use. In order to remove the connecting bracket 4 at the time of dismantling, it is necessary to use a tool to turn the connecting bracket 4 on the separator 5 remaining in the concrete C and loosen the screws. If the screw hole is slightly eccentric with respect to the center line of the cone, it will be restrained by the surrounding concrete and the cone will not rotate, and if it is forcibly removed, it will be damaged. Things have happened often.

[0006]

[Problems to be solved by the invention]

 The present invention solves the above-mentioned problems in the conventional technology, simplifies the manufacturing process by not performing upsetting forging, secures a perfect circle of the cone portion, and reduces the An object of the present invention is to provide a concrete formwork fitting having a screw hole that is not eccentric and that can be easily dismantled and collected even if there is some eccentricity.

[0007]

[Means for Solving the Problems]

 This invention consists of a metal body consisting of a plate-like part with a pin hole near the center and a rod-like part connected to it and having a screw hole at the end for screwing the separator.The large-diameter side is hollow, and the small-diameter side is fitted. A connecting member for a concrete form, comprising a resin cone having a hole, and the cone being fitted to the rod-shaped portion with the large-diameter side facing the plate-shaped portion. It is a connecting metal fitting of the above-mentioned concrete form which is fitted to the rod-shaped part by coupling, and more preferably, a screw for connecting the cone and the rod-shaped part is a screw opposite to a screw hole into which the separator is screwed. This is a connection fitting for the concrete formwork.

[0008]

[Embodiment of the invention]

 According to the present invention, by making the cone part a separate part made of resin, which is manufactured separately, a perfect circle of the cone part is secured, and upsetting forging is not required. The eccentricity was eliminated by machining the and in the same setup, and recovery was facilitated by elastic deformation of the resin.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a connection fitting of a concrete formwork, FIG. 2 is a plan view of the same, 1 is the main body of the connection fitting, 11 is its plate-like portion, 12 is a pin hole provided near the center thereof, and 13 is A rod-shaped portion of the main body 1 connected to the plate-shaped portion 11, a screw hole 16 provided at an end of the rod-shaped portion 13, and a cone 2 different from the main body 1. That is, the metal fittings of the concrete formwork are made of a metal body 1 composed of a plate-shaped portion 11 having a pin hole 12 near the center and a rod-shaped portion 13 connected to the plate-shaped portion 11, and a resin-made body having a large-diameter side hollow. The cone is fitted to the rod 13 with the large diameter side facing the plate 11.

FIG. 3 is a perspective view showing only the main body 1, and reference numeral 14 other than those described in FIGS. 1 and 2 is a stepped portion formed in the middle of a rod 13 connected to the plate 11. The parts 15 are external threads formed on the tip side from the stepped part of the rod-shaped part 13. The material is, for example, carbon steel such as S35C, and heat treatment is appropriately performed. The screw hole 16 is a normal right-hand thread because it is screwed to a general separator, and its dimension is, for example, W5 / 16 to 3/8. On the other hand, the outer surface screw 15 is a left-handed screw in a direction opposite to the normal direction, for example, the size is M14.

If these screws are all in the same direction, that is, a normal right-handed screw, there is a possibility that only the main body 1 will fall out when the connection fitting is removed, and the cone 2 will remain in the concrete. However, if the screw is in the opposite direction, the cone will be tightened against the main body in the direction of loosening the main body from the separator. In addition, since the external surface screw 15 and the screw hole 16 can be machined by the same setup, the centers of the two are not shifted.

FIG. 4 is a cross-sectional view showing the cone 2. The cone 2 is made of a resin such as vinyl chloride, polyurethane, polypropylene, or fluorocarbon resin, and is integrally formed by casting, injection molding, or the like. The large diameter side of the cone is hollow, but the small diameter side is provided with a screw hole (fitting hole) 22 from the stepped portion 21 closer to the large diameter to the end. The screw in the screw hole 22 is a left-handed screw as well, since it engages with the external surface screw 15 on the main body side.

When the cone 2 is screwed in, the respective stepped portions 14 and 21 come into contact with each other and are fixed. At this time, the large diameter side of the cone 2 comes into contact with the shoulder of the plate-shaped portion 11 of the main body 1 and the cone 2 It is important to determine the position of the stepped portion so that no deformation occurs and a gap is left. If deformation occurs, the base of the cone 2 will not be a perfect circle, and there will be no room for escape due to deflection, and the cone 2 will not rotate well during disassembly.

Since the connecting bracket of the present invention is configured as described above, the center of the cone does not deviate from the center of the screw hole 16 and the outer peripheral surface of the cone is smooth and perfect circle, so that the concrete After curing, the connecting fittings can be easily removed by hand without using any tools, and there is no risk of damage, so reliability can be maintained during repeated use. In addition, the main body 1 and the cone 2 are screwed as in this example, and a fitting groove or the like is provided in the rod-shaped portion 13 and the cone 2 side is formed as a fitting hole provided with a projection, and the elasticity of the cone 2 is utilized. Alternatively, they may be fitted together.

[0015]

[Effect of the invention]

 According to the present invention, the manufacturing process is simplified by not performing upsetting forging, a perfect circle of the cone portion can be secured, and the screw hole is not eccentric to the cone portion, so that dismantling and collection are easy. The concrete fittings of the concrete form are realized and the concrete construction is made more efficient, while the connecting fittings are prevented from being damaged and the reliability can be maintained.

[Brief description of the drawings]

FIG. 1 is a front view showing a connecting bracket according to an embodiment of the present invention.

FIG. 2 is a plan view showing the connection fitting of the embodiment of the present invention;

FIG. 3 is a perspective view showing only a main body of the connection fitting according to the embodiment of the present invention;

FIG. 4 is a perspective view showing a cone in the connecting fitting of the embodiment of the present invention.

FIG. 5 is a conceptual sectional view showing a part of a concrete wall according to the present invention.

FIG. 6 is a perspective view showing a conventional connection fitting.

FIG. 7 is an explanatory view showing a manufacturing process of the connection fitting shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Cone 3 Formwork 4 Connecting metal fitting 5 Separator 6 Clip 11, 41 Plate part 12, 42 Pin hole 13 Bar part 14, 21 Stepped part 15 External screw 16, 44 Screw hole 22 Screw hole (fitting hole) 43 Cone concrete

Claims (3)

[Utility model registration claims] 1. A metal member comprising a plate-like portion (11) having a pin hole (12) near the center thereof and a rod-like portion (13) having a screw hole (16) connected to the plate-like portion and screwing a separator at an end. It consists of a body (1) and a resin cone (2) having a hollow at the large diameter side and a fitting hole (22) at the small diameter side. The rod (1
3) A fitting for a concrete formwork, which is fitted in 3). 2. The connection fitting of a concrete formwork according to claim 1, wherein the cone (2) is screwed into the rod-shaped part (13). 3. The connecting metal fitting for a concrete formwork according to claim 2, wherein the screw connecting the cone (2) and the rod-shaped portion (13) is a screw opposite in direction to the screw hole (16) into which the separator is screwed. .