JPH0722437Y2 - Makeup mold assembly fittings - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a metal fitting for assembling a decorative formwork used in the construction of a concrete structure having an uneven pattern on its surface.

[Prior Art] In recent years, when building road side walls, retaining walls, soundproof walls, bridges, and various other large-scale concrete structures, a special formwork called a decorative formwork is used to create an uneven pattern simultaneously with concrete injection. A method of obtaining a surface having the same is becoming widespread. A decorative formwork is made by laminating a foam synthetic resin plate on the concrete driving surface side of an ordinary formwork plywood or steel formwork, and the surface of the synthetic resin plate has irregularities, which results in a relief pattern. Is transferred to the concrete surface.

This decorative formwork is thicker than a normal formwork due to the laminated synthetic resin plate, and the surface of the synthetic resin plate is not always flat, and it is easily deformed. And some modification of the installation method is required. That is, among the metal fittings for mold form assembly, a so-called round separator for keeping the mold space at a predetermined value and a metal fitting main body are connected with a female threaded metal fitting / cone (a.k.a. , Etc. are made longer in the axial direction than before, holes are made in the synthetic resin plate layer of the round separator attachment part so that a cone can be inserted, and the cone is made of plywood or steel plate instead of the surface of the synthetic resin plate. It is necessary to make contact with the part. However, when a long cone is used, a large hole remains after removing the formwork (the hole becomes deeper by the thickness of the synthetic resin plate), so the work of filling this with mortar is more difficult than using ordinary formwork and cones. There was a problem that it was tough. In addition, cement paste (so-called Noro) flows into the gap formed between the cylindrical hole opened in the synthetic resin plate and the truncated cone, and it remains as an unsightly protrusion after removing the form, so that There was a problem that it took time to fix.

[Problems to be solved by the invention]

The purpose of the present invention is a metal fitting that can solve the above-mentioned problems in the concrete placing method using a decorative form, that is, a device specially devised for assembling a decorative form so that no large holes or protrusions are left after the form is removed. , To provide metal fittings equivalent to the cone.

[Means for solving problems]

The decorative mold assembly metal fitting provided by the present invention is such that one half of a round steel bar is processed into a round bar shape having a smaller diameter than the round steel bar, and then it is processed into a male screw to form a connecting portion with the main body of the binding metal fitting, and the other half is , A circular separator connecting portion by processing into a female screw body having the same diameter as a hole provided in a synthetic resin plate that has a screw hole opening portion on its end face and that constitutes a decorative formwork, and of the male screw forming portion and the female screw body. One of the bases (that is, a portion near the boundary between the two) is formed so that the spanner can be engaged.

In order to meet the above-mentioned object of the present invention, it is desirable that the diameter of the round steel bar in the fitting for assembling decorative formwork is not unnecessarily large, and normally about 12 to 15 mmφ is suitable. Also,
The length of the female screw body portion varies depending on the thickness variation range of the synthetic resin plate portion of the decorative form used, but is preferably about 50 to 90 mm. The diameter difference between the internal thread body portion and the external thread forming portion should be about 4 mm or more.

[Action]

When the metal fittings of the present invention are used for assembling a decorative formwork, in the round separator mounting part, a hole having a diameter approximately the same as the diameter of the female screw body part is formed in the synthetic resin plate layer of the formwork, and a hole having substantially the same diameter as the male screw forming part. Make a hole in each of the substrate parts of the mold frame concentrically. Then, screw the round separator into the female thread part of the metal fitting, insert the male thread forming part into the hole prepared in the above mold, and the annular end surface of the female thread body formed by the diameter difference from the male thread forming part to the base plate part of the mold. Abut.
The male screw projecting to the opposite side of the formwork is screwed into the main body of the binding metal fitting in the same manner as the shaft foot in the conventional formwork assembly.

[Embodiment] In one embodiment of the present invention shown in FIGS. 1 to 4, one half of a round steel bar having a diameter D (a substantially half portion on the left side of the drawing) is shaped like a round bar having a diameter d smaller than the round steel bar. Processed into a male screw 1
(The part that can be screwed into the female screw of the binding metal body) and the part processed into the female screw body 4 by forming the female screw 3 for screwing the round separator from the end face 2 on the remaining part of the round bar steel. Become. Then, at the base portion of the female screw body 4, there is a spanner engaging portion 5 formed by cutting it so as to be biased.

Next, a method of using this metal fitting will be described with reference to FIGS. 4 and 5. FIG. 4 shows a state in which a decorative form frame in which a synthetic resin plate 7 having an uneven surface 6 and a plywood 8 are integrated by nails 9 is assembled using the fittings of the above embodiment, the round separator 10, the binding fitting body 11 and the like. FIG. The procedure in this state is basically the same as the procedure for assembling a decorative formwork using a conventional cone, and the tightening force by the metal fitting of the present invention corresponding to the cone does not act on the synthetic resin plate 7 of the decorative formwork. In order to do so, the synthetic resin plate 7 has a female screw body 4
Drill a hole 12 of about the same diameter as. In the conventional method using a cone, a small screw called a shaft foot is inserted into the hole 13 of the plywood 8 to connect the cone and the binding metal fitting body 11, but in the case of the metal fitting of the present invention, the male screw 1 is a hole. It goes through the 13 to the other side of the form and is screwed directly into the binding fitting 11.

When concrete was poured into the formwork assembled as shown in FIG. 4, and after hardening, the formwork was removed by a conventional method, resulting in the state of FIG. 5, and the uneven surface 6 of the decorative formwork 7 was transferred. The metal fitting of the present invention is left on the concrete surface 14 by protruding the male screw 1 side. When the spanner is engaged with the spanner engaging portion 5 to rotate the entire metal fitting and the metal fitting is removed from the round separator 10, a hole having the same diameter as the female screw body 4 is left behind. This hole is filled with mortar.

FIG. 6 shows another example of the metal fitting of the present invention (signs have the same meaning as in the embodiment of FIG. 1). In the case of this example, the thread portion is not formed in the base portion of the small diameter male screw 1 forming portion, and the spanner engaging portion 5 is provided there. In the case of this metal fitting, when used in the same manner as in FIG. 4, the spanner engaging portion 5 enters the hole 13 of the plywood 8. Therefore, even when the synthetic resin plate 7 of the decorative form is very thin, a possible obstacle in the case of the embodiment shown in FIG. 1, that is, a part of the spanner engaging portion 5 protrudes from the hole 12 and is embedded in concrete. There is no problem that it is difficult to rotate and remove the metal fittings.

[Effect of device]

Since the metal fitting of the present invention is constructed and used as described above, it has many advantages as described below.

Compared with the conventional combination of a long cone and a shaft foot, of course, the work of assembling the formwork is simpler by one operation, and the female screw body has a much smaller diameter than the cone, so the hole remaining after removing the formwork was small. As a result, the repair work for filling the mortar becomes easier and the finish is also beautiful (the cone has a limit in terms of stability when used in combination with the stem).

When a cone is used, a slag is left between the truncated cone and the cylindrical hole of the synthetic resin plate and hardens, leaving a projection on the concrete surface after removing the formwork,
In the case of the metal fitting of the present invention, since the metal fitting and the inner wall of the hole are in close contact with each other and no slag is allowed to enter, it is not necessary to remove the protrusion due to the slag after removing the formwork. It goes without saying that a beautiful concrete surface can be obtained.

It is extremely inexpensive because it can be easily made by working round bar steel.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a front view, FIG. 2 is a plan view, and FIG. 3 is a right side view. Fourth
FIG. 5 and FIG. 5 are explanatory views of the usage of the above embodiment.
FIG. 6 is a front view showing another embodiment of the present invention. 1: Male screw, 3: Female screw 4: Female screw body, 5: Spanner engaging part 7: Synthetic resin plate, 8: Plywood 10: Round separator, 11: Main body

Claims (1)

[Scope of utility model registration request] 1. One half of a round bar steel is processed into a round bar shape having a diameter smaller than that of the round bar steel, and is further processed into a male screw to form a connecting portion with a main body of a binding metal fitting, and the other half is formed with a screw hole opening portion at its end surface. A circular separator connecting part is formed by processing a female screw body having the same diameter as the hole provided in the synthetic resin plate constituting the decorative form frame, and a spanner engages either the male screw forming part or the base part of the female screw body. Metal fittings for assembling decorative formwork that are molded to fit.