JPH0242409Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> This invention relates to a spacer mold, and is a plate-shaped mold that is used by fitting into the reinforcing bars in order to reliably maintain the distance between the reinforcing bars and the formwork in reinforced concrete construction. It relates to a mold made of synthetic resin sheet for molding and manufacturing concrete spacers.

<Prior art> As the above-mentioned spacer, a horseshoe-shaped spacer made of mortar is conventionally used.
S' (see Fig. 12), but because of its horseshoe shape, it lacks stability in use, and after being fitted into the reinforcing bar T, it easily comes off or moves from the reinforcing bar T, and the distance between the formwork and the reinforcing bar ( It had the disadvantage that it could not reliably maintain the fog (commonly known as fogging).

Therefore, as shown in FIGS. 5 to 9, the inventor of the present invention formed a reinforcing bar insertion groove 10 in a substantially disc-shaped spacer 1 made of concrete or the like, and also formed a spring embedded in the spacer 1. A part of an elastic body such as a steel wire 2 is made to protrude from the middle of the reinforcing bar insertion groove 10 to form a protrusion 20 for preventing the reinforcing bar from coming off.

Conventionally, concrete spacers have been manufactured by injecting concrete or the like into a form made by assembling metal or wooden frame plates.

However, as mentioned above, it is difficult to manufacture the spacer 1 having a unique structure in which the protrusion 20 is formed by embedding an elastic body such as the spring steel wire 2 using a conventional mold made of metal or the like. be. That is, in the case of the spacer 1 described above, with the spring steel wire 2 held in place, concrete or the like is injected to securely bury the spring steel wire 2 in the spacer 1 and integrate it, or to remove the protrusions. It is necessary to ensure that the parts 20 are placed accurately so that they do not become buried in the concrete and can effectively prevent the reinforcing bars from coming off. However, with conventional molds, it is difficult to arrange the spring steel wire 2 and the like within the mold, and it is difficult to manufacture the protrusions 20 in an accurate shape and arrangement.

In addition, conventional formwork is expensive to manufacture, and because of its bulk, requires a large space to store the formwork, and is also troublesome to handle during concrete molding. Further, it takes a lot of effort to demold the concrete spacer after forming, and it is very difficult to remove the protrusion 20 from the mold without deforming it, especially if the spring steel wire 2 or the like is buried. In addition, maintaining and repairing the formwork was troublesome. Furthermore, the production volume of spacers is limited by the number of costly molds available, making it unsuitable for mass production of spacers. Furthermore, when it comes to transporting and storing the spacers themselves, it is extremely troublesome and time-consuming to handle a large number of spacers separately.

<Purpose> Therefore, the purpose of this invention is to eliminate the drawbacks of the above-mentioned prior art, to provide a spacer molding mold that can efficiently and accurately manufacture the spacer 1 having the above-described unique structure and is easy to handle. It is something to do.

<Structure> And, as a structure to achieve the above purpose, the whole is formed integrally with a synthetic resin sheet,
A plurality of approximately disk-shaped spacer molding recesses are formed on the upper surface, and the molding recesses are formed with a notched protrusion for reinforcing reinsertion grooves that continues in the radial direction from the outer periphery to the center. A feature is that a supporting recess for the reinforcing bar retaining protrusion is formed in the middle of the cutout protrusion.

<Example> Next, an example of this invention will be described below with reference to the drawings.

In FIGS. 1 and 2, 3 is a mold, which is formed by molding a synthetic resin sheet such as a foamed polystyrene sheet using a sheet forming means such as vacuum forming into a shallow disc shape corresponding to the outer shape of the spacer 1. A plurality of molding recesses 30 are formed in parallel.

A part of the molding recess 30 has a convex portion 31 that is flush with the upper surface of the mold 3 and continues with a constant width in the radial direction from the outer periphery to the center of the molding recess 30.
is formed to form a reinforcing bar insertion groove, which will be described later. Further, in the middle of the convex portion 31 in the radial direction,
A support recess 32 is formed which is shallower than the molding recess 30, and this support recess 32 is formed into a narrow groove extending obliquely from both side walls of the projection 31 toward the center. Further, the side wall 33 of the convex portion 31 is formed in a tapered shape that is inclined from the top to the bottom, and is widened toward the base near the base of the convex portion 31 to be thick.

A method of molding and manufacturing the spacer 1 using the mold 3 as described above is shown in FIGS. 3 and 4.

First, a spring steel wire 2 made of a piano wire or the like which has been bent into a substantially C shape in advance as an elastic body is inserted into the molding recess 30, and both ends of the spring steel wire 2, which will become the projections 20, are inserted into the mold. It is inserted into the support recess 32 of No. 3 and is supported and held. At this time, both ends of the spring steel wire 2 are bent obliquely toward the center,
The spring steel wire 2 is tightly inserted and held in the support recess 32, and the center portion of the spring steel wire 2 is suspended in the inside of the forming recess 30. (See Figure 2). In this state, as shown in FIG. 4, concrete, mortar, or the like is poured into the molded recess 30 and dried and hardened. However, do not pour concrete or the like into the support recess 32.

If the spacer 1 thus formed is removed from the mold along with the protrusion 20 of the spring steel wire 2, the protrusion 20
This means that the attached spacer 1 can be manufactured.

Next, the spacer 1 manufactured as described above will be explained in detail with reference to FIGS. 5 to 9.

The spacer 1 as a whole has a substantially disk shape corresponding to the shape of the forming recess 30, and a reinforcing bar insertion groove 10 corresponding to the shape of the protrusion 32 is formed. The reinforcing bar insertion groove 10 has spacers 1 formed intermittently along the radial direction from the outer periphery to the center of the spacer 1 with a width slightly wider than the outer diameter of the reinforcing bar to be installed, so that the reinforcing bar can be inserted into the center of the spacer 1. It is formed in Further, the center portion of the reinforcing bar insertion groove 10 is formed in an arc shape concentric with the center of the spacer 1, and the outer peripheral portion of the reinforcing bar insertion groove 10 is formed in a tapered shape that gradually widens toward the outer periphery. This makes it easier to insert the reinforcing bars, and the reinforcing bars can be inserted stably. Further, the tapered side wall surface 11 formed by the tapered side walls 33 in the front and back directions of the convex portion 31 of the mold 30 facilitates insertion of reinforcing bars.

Next, as a spring steel wire 2 serving as an elastic body, a spring steel wire 2 formed into a substantially C-shape made of piano wire or the like having excellent elasticity is embedded and integrated within the spacer 1. Both ends of the spring steel wire 2 are bent diagonally toward the center of the spacer 1, and protrude from the inner wall of the reinforcing bar insertion groove 10 into the groove and are exposed in the shape of a protrusion. This prevents the reinforcing bars from coming off. That is, the protrusions 20 of the spring steel wire 2 protrude obliquely toward the center from both side walls of the reinforcing bar insertion groove 10 of the spacer 1 in a V-shape, and the gap between the protrusions 20 on both sides is It is formed to be slightly narrower than the diameter of the reinforcing bar.

How to use the spacer 1 is shown in FIGS. 8 and 9. First, similar to conventional reinforcing bar construction, formwork K is assembled and reinforcing bars T and t are arranged. Among the reinforcing bars, T is the main reinforcing bar, and t is the main reinforcing bar T.
This is a starrup placed between the two.

Then, in order to reliably maintain the distance between the reinforcing bars T, t and the formwork K, spacers 1 are fitted into the reinforcing bars T, and the spacers 1 are fitted between the reinforcing bars T and the formwork K. so that That is, the reinforcing bar insertion groove 10 of the spacer 1 is fitted into the reinforcing bar T from the outer periphery, and the spring steel wire 2 protrudes inside the reinforcing bar insertion groove 10.
When the protrusion 20 is inserted to the center while being elastically pushed away by the reinforcing bar T, the reinforcing bar T is placed at the center of the spacer 1. Since the protrusion 20 elastically returns to its original state, even if the reinforcing bar T tries to slip out of the reinforcing bar insertion groove 10, the protruding part 20 that protrudes diagonally toward the center will catch and prevent the reinforcing bar T from coming out. It will be prevented.

Note that the distance between the formwork K and the reinforcing bars T can be set to an arbitrary width depending on the radius of the spacer 1.

In this way, when concrete is poured after the reinforcement arrangement is completed, reinforced concrete construction is completed with the reinforcing bars T, t and spacer 1 remaining buried in the concrete.

Among the spacer molding molds 3 explained above,
As the synthetic resin sheet forming the molding die 3,
polystyrene, polyethylene, polypropylene,
Foam sheets made of various other synthetic resins are lightweight and easy to handle, and have a good cushioning and protection effect when transported with the spacer 1 placed in the molding recess 30 of the mold 3. A non-foamed sheet can also be used.

Then, using the above synthetic resin sheet, by vacuum forming, pressure forming, or other sheet forming means,
A molding die 3 having a predetermined molding recess 30 and the like may be manufactured by molding. Although it is possible to form only one molding recess 30 in one mold 3, it is usually preferable to form a large number of molding recesses 30 in parallel vertically and horizontally to efficiently form the spacer 1. It can be manufactured and is suitable.

Next, as the concrete to be poured into the forming mold 3, it is preferable to use the same material as that used for reinforced concrete construction because it has good integrity with the poured concrete. If a reinforcing material such as glass wool is mixed into the concrete, the strength and durability of the spacer 1 can be increased. Furthermore, lightweight concrete in which lightweight aggregate such as foamed synthetic resin particles is mixed with concrete can also be used.

As for the shape of the spacer 1 to be molded, it is preferable that it be formed into a thin, substantially disk shape because it is lightweight and easy to handle. In addition to having the same thickness throughout, the spacer 1 may be made thicker at the center than at the periphery, or may be thicker at the opening side of the reinforcing bar insertion groove 10, which is located downward during use, to increase strength. The shape of the molding recess 30 is set corresponding to the shape of the spacer 1 (see FIG. 11).

The dimensions of the spacer 1 will be changed as appropriate depending on the diameter of the reinforcing bar T to be constructed, etc., but for normal construction, a diameter of about 7 mm is used. If you incorporate 1, you can use it effectively. In addition, for large-scale civil engineering construction, those with a diameter of about 10 to 15 mm are used.

Next, as the spring steel wire 2, a wire made of a material that has excellent elasticity, such as piano wire, can be deformed when the reinforcing bar T is inserted, and has good restorability can be used. In addition, it is preferable that the spring steel wire 2 is formed into a substantially C-shape and is buried in the spacer 1 because it is easy to manufacture, has excellent strength, and also serves as reinforcement for the spacer 1 as a whole. As shown in FIG. 10, only the parts near both protrusions 20 are
A separately formed L-shaped spring steel wire 2 is inserted into a forming mold 3.
By placing the protrusions 20 in the respective supporting recesses 32, the manufactured spacer 1 can have a protrusion 20 that is externally exactly the same as the embodiment shown in FIG.

Furthermore, as the elastic body, a synthetic resin wire or molded body can be used instead of the spring steel wire 2, as long as it has the same elasticity and strength as the piano wire.

<Effects> According to the spacer mold 3 of this invention configured as described above, the mold 3 formed from a synthetic resin sheet has a molding recess 30 corresponding to the shape of the entire spacer, and a reinforcing bar inserted therein. A convex portion 31 corresponding to the molding groove is formed, and a concave portion 30 for molding is formed.
The spacer 1 is molded and manufactured by pouring concrete into the inside of the spacer, and a supporting recess 32 is formed in the radial direction of the protrusion 31 to support the protrusion 20 that prevents the reinforcing steel from coming off. By doing so, the protrusion 20 made of a separate elastic body or the spring steel wire 2 can be reliably placed within the concrete spacer 3, and the protrusion 20 can be prevented from moving or shifting during the manufacture of the spacer 1. can be reliably prevented.

In particular, since the support recess 32 is made of a synthetic resin sheet that is more elastically deformable than wooden or metal molds, the protrusion 20 can simply be inserted using the elasticity of the support recess 32. Thus, the protrusion 20 is securely fixed.

Regarding the shape of the molding recess 30, etc.,
Since it is made of synthetic resin sheet,
Even complex shapes can be easily formed, spacers 1 with much more free shapes can be formed than conventional wooden molds, and the manufacturing cost of the mold 3 is also very low.

In addition, since the mold 3 itself is lightweight and has low bulk,
The molded spacer 1 can be transported and stored while being stored in the mold 3, and the spacer 1 can be well protected, which is very convenient. Moreover, in order to transport and store only the molding molds 3, the molding molds 3 can be stacked on top of each other, making it easy to handle.

[Brief explanation of the drawing]

The figures show an embodiment of this invention and a conventional example. Fig. 1 is a partial plan view of an embodiment of this invention, Fig. 2 is an enlarged sectional view, Fig. 3 is a plan view of the process of use, and Fig. FIG. 4 is a cross-sectional view of the process of use, and FIG. 5 is a plan view of the manufactured spacer.
Fig. 6 is a front view, Fig. 7 is a sectional view, Fig. 8 is a perspective view of the used state, Fig. 9 is a sectional view, Fig. 10 is a plan view of an example of changing the use of the mold, and Fig. 11 is FIG. 12 is a sectional view of a modified example of the mold, and a plan view of a conventional spacer. 1... Spacer, 10... Rebar insertion groove, 2...
... Spring steel wire, 20 ... Protrusion, 3 ... Molding mold,
30...Molding recess, 31...Protrusion, 32...Supporting recess.

Claims (1)

[Claims for Utility Model Registration] 1. The whole is integrally formed of a synthetic resin sheet,
A generally disk-shaped spacer molding recess is formed on the upper surface, and the molding recess is formed with a cutout convex part for reinforcing bar insertion grooves that continues in the radial direction from the outer periphery to the center. A mold for forming a spacer, characterized in that a supporting concave portion for a protrusion to prevent a reinforcing bar from coming off is formed in the middle of the removed convex portion. 2. The spacer mold according to claim 1, wherein a plurality of molding recesses are formed side by side. 3. The mold for molding a spacer according to claim 1, wherein the synthetic resin sheet is a foamed sheet.