JPS64537B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is used for buried anchors, that is, in construction or civil engineering work, by excavating a hole 5 in the soil in a desired direction as shown in FIG. This invention relates to a spacer S for accurately supporting reinforcing bars or wires 7 inserted into concrete 6 or the like to be poured into the concrete.

<Prior art and its problems> Spacers used for this purpose have both ends of a suitably bent support piece connected and fixed to the insertion opening by spot welding or riveting, but there are many fixing points, making it difficult to manufacture. It is labor-intensive and expensive, and there are concerns about its strength.

<Means to solve the problem> This method is manufactured from a single metal plate through a continuous process, has no fixing or welding parts, and is suitable for mass production.
The aim was to increase strength and reduce manufacturing costs.

<Example> As shown in FIGS. 1 and 2, the insertion holes 1, 1 at both ends, each having a lateral reinforcing protrusion 2 formed by extrusion, have a hollow cylindrical shape and connect the two insertion holes 1, 1. It is characterized in that it is constructed from a single metal plate in which the central portions of a plurality of support pieces 3 are bent and bulged outward from the cylinder.

Next, the manufacturing method of the above spacer will be explained.
As shown in FIGS. 3 and 4, reinforcing ridges 2, 2 are extruded and formed parallel to each other at appropriate intervals in the width direction of a continuous strip-shaped metal plate 10.
A first step of punching out a plurality of longitudinal holes 14 between them to form a punched plate A that connects to the strip metal plate 10 with small connecting pieces 15; The second step is to pre-bend the entire body into a waveform shown by the broken line in FIG. They are brought into contact with each other with a gap L between them, and through a third process of bending into an occluded cylindrical shape, the connecting piece 15 is cut off to form a single piece C having an occluded cylindrical shape.

In any step among the first to third steps, for example, in the first step, the center portions of the plurality of support pieces 3 formed by the punched holes 14 are slightly moved toward the outside of the cylindrical body as shown in FIG. Press and bend. This step may be performed in the second step or the third step.

Next, as shown in Fig. 5, the single piece C is pressurized in the longitudinal direction of the cylinder by the pressurizer P, and the support piece 3 is pressed down by a slight amount l in the center. It bends and bulges outward, and the degree of bulge is determined by the pressure machine P.
Can be freely adjusted by applying pressure stroke.

<Effects of the Invention> As described above, according to the present invention, since it is formed from a single sheet metal and there are no welded or riveted parts, it is possible to mass-produce a uniform product with high strength and continuous processing at a low cost. In particular, the central part of the supporting piece 3 of the single cylinder C can be bent and expanded as desired by a simple pressurizing operation, since the bending direction is oriented by a slight pressure l. Support piece 3
Since the degree of expansion can be freely adjusted by the pressurizing stroke, there is also the effect that the molds used in the first to third steps can be shared within a range where the product dimensions are different. In addition, during use, due to the expansion of the support piece 3, the width of the central part of the punched hole 14 is greatly expanded, making it easier for the filling concrete to flow into the support piece, completely covering the inserted reinforcing bar or wire, A strong buried anchor with no voids can be formed.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the anchor according to the present invention, FIG.
The figures are Fig. 1 AA longitudinal front view, Fig. 3 a plan view showing the manufacturing process, Fig. 4 a side view thereof, Fig. 5 a front view in a pressurized state, and Fig. 6 the present invention. It is an explanatory view of the use state of the spacer concerning this. DESCRIPTION OF SYMBOLS 1...Insertion port, 2...Reinforcement protrusion, 3...Support piece, 10
...Band-shaped metal plate, 14...Punching hole, 5...Connecting piece, A
...Punched metal plate, B...Pre-bent plate, C...Cut cylinder unit.

Claims (1)

[Scope of Claims] 1 A metal plate is wound into a hollow cylindrical shape, and circumferential reinforcement protrusions are extruded along the insertion holes at both the upper and lower ends, and a plurality of support pieces connecting the insertion holes are formed. A spacer for a buried anchor, characterized in that it is made of a single metal plate whose central portion is bent and bulged outward from a cylindrical body. 2 Reinforcing ridges parallel to the width direction are formed by extrusion at appropriate intervals in the length direction of a continuous metal strip, and a plurality of lengths are formed between the parallel reinforcing ridges. A first step in which a metal plate in which a plurality of supporting pieces are formed by punching holes in different directions is connected to a band-shaped metal plate leaving a few connecting pieces; and both sides of the punched metal plate after the first step. a second step of pre-bending the material into a curved surface that matches the radius of the insertion opening;
After completing the process, the punched metal plate undergoes a third step of being bent and wound into a hollow cylinder shape with a gap of an appropriate width between both sides, and then the connecting piece is cut off to form a single hollow cylinder. During any step in the process, the center portions of the plurality of support pieces formed between the punched holes are slightly pushed out to the outside of the hollow cylinder to bend them, and then both ends of the single piece are applied in the vertical direction. A method for manufacturing a spacer for a buried anchor, which comprises pressing the support piece to bend and bulge the center part of the support piece outward from the cylinder.