JP2616862B2 - Manufacturing method of continuous spacer and molded product for continuous spacer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spacer for preparing a concrete cover between a reinforcing bar and a surface of a concrete product between a formwork and a reinforcing bar when the concrete is crushed. The present invention relates to a method of manufacturing a continuous spacer corresponding to a plurality of spacers and a molded product for a continuous spacer with a core material.

[0002]

2. Description of the Related Art There are spacers made of concrete blocks and plastic pieces. The spacers are erected at intersections of reinforcing bars, fitted into appropriate places of reinforcing bars, and further placed on a horizontal form to support the reinforcing bars. I have.

[0003]

In the case of large concrete products, for example, floor slabs and piers of road bridges, a large number of spacers are required, and it is very troublesome to attach them to reinforcing bars one by one. SUMMARY OF THE INVENTION An object of the present invention is to provide a single spacer so as to achieve the same effect as that of installing a plurality of conventional spacers. Another object of the present invention is to make it possible to use it only by hanging it on a horizontal reinforcing bar. It is still another object of the present invention to provide a spacer that does not require the spacer to be displayed on the product surface as much as possible.

It is still another object of the present invention to provide a spacer which does not fall apart when subjected to an impact when it is of a continuous type. Still another object of the present invention is to provide
It is an object of the present invention to provide a manufacturing method for easily manufacturing a spacer that does not fall apart. Still another object of the present invention is to provide a method for easily manufacturing a spacer which is curved in the longitudinal direction.

[0005]

[Means for Solving the Problems]

The continuous spacer according to the present invention is an extruded product having a uniform cross-sectional shape formed of a curable raw material, and has a non-self-supporting side portion which comes into contact with the mold on the cross-sectional contour. Then, the molded product is cured in a state in which the side portion is bent in the left-right direction at a portion which is continuous in the longitudinal direction of the molded product, and has a length having a bent portion capable of at least being self-supporting. I have.

[0007] Still another continuous mold spacer of the present invention is an extruded product of a curable raw material, in which a concave and convex portion that repeats in a wavy shape is formed on the side in contact with the mold surface. frame
Having a cross-section that is difficult to stand on
Is bent right and left along the longitudinal direction of the molded product, and its length
The molded product has a length that allows it to be self-supported by the bent portion, and is formed by hardening this molded product with a required length.

[0008] In any of the above cases, the molded article has a core material which is continuous in the longitudinal direction inside the molded article, and this core material may be integrated with the molded article after the molded article is cured .

A method of manufacturing a molded product for a spacer is as follows. A core material is introduced from the outside toward the opening of the nozzle at the center of the molding nozzle, and the raw material and the core material are interposed between the raw material and the core material during the consolidation process when the raw material passes through the nozzle. The resistance causes the core to be continuously drawn into the raw material.

In the manufacturing method having a corrugated uneven portion, a core material is introduced from the outside toward the opening of the nozzle at the center of the molding nozzle, and the raw material and the core material are condensed when the raw material passes through the nozzle. Due to the mutual resistance, the core material is continuously drawn into the raw material and extruded, and the sprocket provided on the movement path of the extruded molded product is rotated by the molded product to continuously form a wavy shape on the molded product. An uneven portion is formed.

[0011] In addition, a method of manufacturing a molded product for a spacer which is curved in its longitudinal direction is to intermittently extrude a raw material from a molding nozzle, cut the extruded product to a predetermined length when intermittent feeding is stopped, and The piece is formed while being fed by a forming die in a direction perpendicular to the moving direction of the formed product.

[0012]

The continuous spacer in which the hook is formed is used for the wall surface. The spacer hooks or clips are engaged in place on the rebar and the lower portion is hung such that the spacer is located between the assembled rebar and the formwork. If the mold is pressed against the outer surface of the spacer to assemble the mold, the cover size of the concrete is secured between the reinforcing bar and the form surface.

A continuous spacer having a bent portion along the longitudinal direction is suitable for reducing the amount of raw material used and ensuring a sufficient cover size between the reinforcing bar and the formwork.
A plurality of the spacers are placed at appropriate positions on the mold and on a plane where the plane on which the spacer is bent or meandered is parallel to the plane of the mold, and a reinforcing bar is supported on these spacers. The cover dimension is between the mold surface and the reinforcing bar. The form of the bend can be arbitrarily determined, such as a triangular shape, a trapezoidal shape, a wavy shape, a continuous shape thereof, a combination thereof, and the like.

When the cross-sectional shape is triangular, the spacer is placed on the mold so that one top side of the cross-section is in contact with the mold surface. In the case of a rectangular shape, one short side is placed on the mold surface. Both can be stably placed on the form surface due to the presence of the bent portion.

When the corrugated uneven portion is formed on the contact side with the mold surface, the spacer is intermittently contacted with the mold, so that the exposed portion of the spacer on the outer surface of the product is limited. If a hook or a clip is provided on the one end in the length direction on the side opposite to the uneven portion side, the hook or the clip is hooked on a horizontal rebar and hung.

[0016] The molded product has a cross-section at the convex portion, which is difficult to be self-sustained with respect to the mold surface, and this cross-section is bent right and left along the longitudinal direction of the molded product, and its length is determined by the bent portion. If the length is such that it can be self-supporting, it is only necessary to place a spacer on the formwork surface, and the contact portion with the formwork surface is further reduced.

The cross section is the top of a triangular shape,
In the case of a rectangular short side, the raw materials used are further reduced,
The contact portion with the mold surface is further reduced. If there is a continuous core material inside the spacer, even if the spacer is broken, the core materials are connected to each other, so that they do not fall apart.

A core material is introduced into the center of the molding nozzle from the outside toward the opening of the nozzle, and the core material is mixed with the raw material due to the resistance between the raw material and the core material during the consolidation process when the raw material passes through the nozzle. When the core material is continuously drawn into the molded product, the core material enters the molded product continuously by one person.

A core material is introduced into the center of the molding nozzle from the outside toward the opening of the nozzle, and the resistance between the raw material and the core material during the consolidation process when the raw material passes through the nozzle causes the core material to be mixed in the raw material. When the sprocket provided at the movement path of the extruded molded product is rotated by the molded product to continuously form wavy irregularities on the molded product, the spacer The concave and convex portions are automatically formed continuously.

The raw material is intermittently extruded from a molding nozzle, the extruded product is cut to a predetermined length when intermittent feeding is stopped, and the cut piece is formed while being sent by a forming die in a direction perpendicular to the moving direction of the formed product. Then, the molded product for the spacer curved in the longitudinal direction is automatically and continuously produced.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings, identical reference numbers indicate identical or corresponding parts. 1, 2 and 3, reference numeral 1 'denotes a molded product, which is an extruded product having a uniform cross section of a curable raw material, for example, mortar. The cross-sectional shape may be an appropriate shape such as a circle, a triangle, a square, and a rectangle. This molded product 1 'is cut into a predetermined length, and at least one end is folded on the same plane to form a hook 2 in FIG. 2, and a clip 2' is embedded in FIG. It becomes the spacer 1.

In order to use this spacer 1, as shown in FIG. 4 or 5, it is hung by hanging the hook 2 or the clip 2 'from the outside to an appropriate place of the assembled horizontal reinforcing bar 3. An appropriate number of such spacers 1 are hung at appropriate positions on appropriate horizontal reinforcing bars 3. Then, the formwork 4 for regulating the side surface of the concrete product is pressed against the outside of these spacers 1 and assembled. If concrete is cast, a portion corresponding to the width or diameter K of the spacer 1 has a cover size.

FIGS. 6 and 7 show continuous spacers each having self-supporting properties and suitable for horizontal installation. Also in these cases, a hook type or clip may be provided at one end as shown in FIGS.

In the case of FIG. 6, since the cross section is triangular, it is possible to stand alone by using one of the three sides except for the side part 5 which is difficult to stand alone. become. When concrete is cast in this state, one side of the spacer appears on the surface of the product,
Not preferred. Therefore, it is preferable to use the one ridge line 5 'of the triangular prism-shaped spacer, since the spacer only appears linearly on the surface of the product, but the spacer cannot stand alone in that state. Therefore, in the state of the molded product 1 ', one ridge 5' is bent in the left-right direction, and the molded product 1 'is cured.
It may be bent in any manner and may meander, and it is sufficient that the spacer 1 can stand alone with the ridge 5 'as the bottom.

FIG. 7 shows a case where the cross section is a rectangular spacer.
The same can be said for the case of FIG. It is easy to place the spacer 1 on the surface of the mold frame 4 on the long side 6 of the cross section, but the entire length of one surface of the spacer 1 appears on the surface of the product. In order to prevent this, if the short side, which is the side part 5 of independence, is placed on the form 4 surface, it tends to be overturned. Therefore, the continuous surface 5 ″ on the short side is bent in the left-right direction on the plane including the continuous surface in the same manner as described above. As a result, the spacer 1 is given autonomy.

FIG. 8 shows the use state of the spacers shown in FIGS. 6 and 7 together. In the spacer 1 of FIG. 6, the ridge line 5 'is scattered on the upper surface of the horizontal mold 4'. Further, the spacer 1 shown in FIG.
This is also scattered on the top surface. When the horizontal reinforcing bar 3 is stretched over these spacers 1, the horizontal reinforcing bar 3 and the formwork 4 'are formed.
The cover size of the concrete with the height H of the spacer is secured between the surfaces.

FIGS. 9 to 11 show the case where the corrugated irregularities 11 are formed on the contact side with the mold surface in a state of being used on the horizontal mold 4 'surface. 10 and 11 correspond to FIGS. 6 and 7, respectively, and have been deformed in the longitudinal direction to provide independence. Both are uneven part 1
1 is used so as to face the formwork 4 or 4 '.

When used on the surface of the vertical formwork 4,
As shown in FIG. 12, when a horizontal reinforcing bar 3 or a vertical reinforcing bar 3 ′ is attached to a horizontal reinforcing frame 4 ′ by using a wire, the horizontal reinforcing bar is placed on the horizontal forming surface 4 ′ and placed on the horizontal forming surface 4 ′. You just need to put 3 on it. FIG. 13 corresponds to FIG. 2 and has a hook 2 at one end, and the usage is in accordance with FIG.

In each of the above examples, the molded article 1 'is provided with a core 21 which is continuous in the longitudinal direction inside the molded article 1', and this core 21 is integrally formed with the molded article 1 'after the molded article 1' is cured. Thus, the spacer 1 is formed. An appropriate material such as cotton, synthetic fiber, and metal can be selected as the material of the core 21. This core material 21 can be used even when the spacer 1 is broken due to its length.
Prevent it from becoming discrete.

FIG. 14 shows a spacer 1 having a core material 21.
The following shows the production method. The raw material M passes through a feeder 33 having a hopper 31 and a screw 32, and is continuously extruded from a forming nozzle 34 attached to the feed end in a predetermined sectional shape. The core material 21 is stored in a core material supply source 35, and the tip of the core material 21 projects through an introduction pipe 36 extending from the side surface of the nozzle 34 to the center portion thereof, facing the outlet 37 in the nozzle. Since the raw material M is compacted while passing through the nozzle 34 due to the reduction in its cross-sectional area, the core material 2
1 and the core material 21 is dragged.
If the resistor 22 such as a bump is formed on the core 21, the pull of the core 21 is ensured. This molded product 1 '
Is cut to an appropriate length and cured to obtain a spacer in which the core material 21 is integrally fixed to the raw material M.

Numeral 38 denotes a rotation type sprocket installed near the outlet 37 of the molding nozzle 34, the thickness of which is shown in FIG.
As shown in FIG. 5, it is sufficient that one surface of the molded product 1 'has a size sufficient to form a concave portion 11' whose both ends are open on the cross section. The rotation passage of the sprocket teeth portion of the sprocket 38 enters the movement passage of the molded product 1 '. Therefore, when the molded product 1 ′ comes out of the nozzle 34, the sprocket 38 is rotated on the side surface, and the uneven portion 11 is continuously formed on the molded product 1 ′.

FIG. 16 shows a method of bending a molded product in the longitudinal direction. The molded product 1 'extruded from the nozzle 34 is cut into a predetermined length by a cutter (not shown). One or more cutters may be used. A mold 39 is located on the same plane 40 as the molded product 1 'and is capable of moving back and forth in a direction perpendicular to the advancing direction thereof.
Is formed. By moving the mold 39 forward, the molded product 1 '
Each of the cut pieces is pressed by the mold 39, adapts to the curved surface 41 during its movement, and remains at that position when the mold 39 returns. When this is cured, it becomes a spacer curved in the longitudinal direction.

[0033]

According to the present invention, since the spacers need only be placed on the mold, workability can be greatly improved.

According to claim 2, to reduce the portion of the spacer appears at product portion, only yet placed on the mold
And use less material. Claim 3
According to the above, since it is reinforced by the core material,
Easy to handle and easy to handle.

[0035] According to claims 4 and 5, the raw material forming step
The core material can be automatically drawn into the molded product with
And then automatically form wavy irregularities on the molded product
You can also. According to claim 6, it is curved in the longitudinal direction.
The spacers can be formed continuously and automatically.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of an example of an extruded product.

FIG. 2 is a perspective view showing an example of a continuous spacer.

FIG. 3 is a perspective view showing an example of a spacer with a clip.

FIG. 4 is a side view of the used state of the spacer shown in FIG. 2;

FIG. 5 is a side view of the used state of the spacer shown in FIG. 3;

FIG. 6 is a perspective view of a spacer having a triangular cross section.

FIG. 7 is a perspective view of a spacer having a rectangular cross section.

FIG. 8 is a perspective view illustrating a use state of the spacer shown in FIGS. 6 and 7;

FIG. 9 is a perspective view showing another example of the continuous spacer.

FIG. 10 is a perspective view showing still another example of the continuous spacer.

FIG. 11 is a perspective view showing still another example of the continuous spacer.

FIG. 12 is a side view of the used state of the spacer shown in FIG. 9;

FIG. 13 is a side view of the use state of the spacer of FIG. 9 corresponding to FIG. 2;

FIG. 14 is an explanatory diagram of a method of manufacturing a continuous spacer containing a core material and further having a wavy uneven portion.

FIG. 15 is a cross-sectional view of the sprocket shown in FIG. 14;

FIG. 16 is a schematic perspective view of an apparatus used for a method of bending a molded product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spacer 1 'Molded product 2 Hook part 5 Side part 5' Ridge 5 "Continuous surface 21 Core material M Raw material 34 Nozzle 37 Outlet 39 type

Claims (6)

(57) [Claims] 1. An extruded product (1 ') having a uniform cross-sectional shape of a curable raw material, having a non-self-supporting side portion (5) in contact with a mold on a cross-sectional profile, and this side portion is formed of a molded product. A continuous spacer characterized by being hardened in a state where a portion continuous in the longitudinal direction is bent in the left-right direction and having a length having at least a bent portion capable of being self-supporting. 2. A curable raw material extrusion molding (1 '), uneven part recurring corrugated on the side in contact with the mold surface (11) is formed, the mold on the convex portion of the uneven portion (11) Independence of frame
It has a cross section, and this cross section is in the longitudinal direction of the molded product (1 ').
Bend left and right along
A continuous spacer characterized in that it is self-supporting in length and is formed by curing this molded product (1 ') to a required length. 3. The molded article (1 ′) has a core material (21) continuous in the longitudinal direction inside thereof, and the core material (21) is a molded article (1 ′).
Claim 1 or 1 which is integrated with the molded article (1 ') after curing
3. The continuous spacer according to 2. 4. A core material from the outside at the center of the molding nozzle (34).
(21) into the nozzle outlet (37) and introduce the raw materials (M)
The core material (21) is continuously drawn into the raw material (M) due to the resistance between the raw material and the core material during the consolidation process when the material passes through the nozzle (34) to form a molded product (1 '). A method for producing a molded product for a continuous spacer characterized by the following. 5. A core material from the outside at the center of the molding nozzle (34).
(21) into the nozzle outlet (37) and introduce the raw materials (M)
Due to the resistance between the raw material and the core during the consolidation process when passing through the nozzle (34), the core (21) is continuously drawn into the raw material (M) and extruded. The sprocket (38) provided at this time is rotated by this extruded product to form a molded product (1 ′) having a wavy uneven portion (11) continuously, characterized in that it is formed for a continuous spacer. Product manufacturing method. 6. A raw material (M) is intermittently extruded from a molding nozzle (34), the extruded product is cut to a predetermined length when intermittent feeding is stopped, and a cut piece is cut with a molding die (39). A method for producing a molded product for a continuous spacer which is continuously bent in the longitudinal direction, wherein the molded product is molded while being sent in a direction perpendicular to the moving direction of the molded product and cured.