JP2760718B2 - Method for manufacturing PC product and movable unevenness forming member used for the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner mold and an outer mold which are arranged substantially concentrically, and concrete is poured into a concrete casting space formed between the two forms. The present invention relates to a method for manufacturing a PC product, in which the PC product is released along the molding surfaces of an inner mold frame and an outer mold frame after concrete has hardened, and an uneven forming member used in the method.

[0002]

2. Description of the Related Art In order to manufacture a PC (precast concrete) product, for example, a hollow product such as a concrete pipe or a building PC column formwork, the molding necessary for shaping the inner shape and outer shape of the product. An inner mold and an outer mold having surfaces are used. Both formwork are arranged substantially concentrically, concrete is poured into the concrete placing space between the formwork, and the concrete is released when the concrete hardens.

[0003] In recent years, as disclosed in Japanese Patent Publication No. 1-15361, in order to improve the production efficiency of the PC product, a mold for molding is filled with zero slump concrete, and the concrete is placed on a shaking table. Means have been proposed to accelerate the hardening of concrete by pressing and enable immediate demolding.

However, in such a conventional PC product forming mold, when the PC product is released from the mold, the inner mold frame and the outer mold frame are pulled out in the cylinder axis direction of the PC product as described above. Therefore, it was not possible to manufacture a PC product having an uneven portion on the inner surface or the outer surface. For example, when molding a PC column formwork as a PC product, it is not possible to protrude an uneven portion (shear cotter) inside the PC column formwork, and therefore, it is cast into the PC column formwork on site. However, there has been a problem that the bonding property with the post-cast concrete is lowered, and it is impossible to further increase the strength of the concrete column.

[0005] In view of the above-mentioned problems, the present invention provides a method of removing a PC product in a direction parallel to the inner mold frame and the outer mold frame (along the molding surfaces of both molds). It is an object of the present invention to provide a method of manufacturing a PC product capable of forming irregularities on the surface of a PC, and a movable irregularity forming member used therefor.

[0006]

Means for solving the problems According to the first aspect of the present invention, an inner mold and an outer mold are arranged substantially concentrically. A movable uneven forming member movable in a direction parallel to the outer mold and in a direction intersecting with the outer mold and having irregularities formed on one side is directed to the molding surface of the inner mold with the irregularities forming surface facing the outer mold. Concrete is poured into a concrete casting space formed between the inner and outer molds, and after the cast concrete is solidified, the movable uneven forming member, the solidified concrete, and the outside. Moving the mold in a direction parallel to the inner mold and removing it from the inner mold, and then moving the movable uneven forming member in the centripetal direction that intersects with the outer mold to separate it from the solidified concrete. According to the second aspect, the hollow inner mold and the outer mold are arranged substantially concentrically. A direction parallel to the mold and the outer mold, and a movable asperity forming member that is movable and bendable in the direction intersecting is disposed on the molding surface of the hollow inner mold, and the inner mold and the outer mold are provided. Concrete is poured into the concrete casting space formed between the concrete form, and after the cast concrete is solidified, the solidified concrete and the outer form are moved in a direction parallel to the hollow inner form to form the inner form. 4. The method according to claim 3, wherein the movable concave / convex forming member is sequentially housed in the hollow inner mold from the upper portion of the hollow inner mold while removing the mold from the hollow inner mold. In the fourth aspect, a substrate having a substantially equilateral angle steel shape and a short length in plan view and a flexible interval holding piece are alternately connected by a flexible connecting strip. That is to do.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. PC shown in FIG.
An example in the case of manufacturing a product (PC frame for pillar of building material) will be described.

A basic manufacturing means common to the first and second aspects of the present invention is that an inner mold 1 and an outer mold 2 are substantially concentrically fitted and arranged as shown in FIG. Concrete c is cast from the hopper 15 into the concrete casting space 4 formed therebetween. Vibration is applied to the outer mold frame 2 by a vibrator, and the cast concrete c is compacted by the vibration of the vibrator. By compacting the cast concrete c by such a vibrator and lowering the pressurizing machine 16 to press the cast concrete c, the cast concrete c is pressurized to be compacted, and the concrete is solidified. Promoted. And when the cast concrete c is solidified,
The outer mold frame 2 is raised and removed.

The inner mold frame 1 and the outer mold frame 2 used in claim 1 are formed in a rectangular shape in plan view as shown in FIG. 4, and the main body is made of a rigid material such as steel, hard rubber or the like. . And
The movable unevenness forming member 3 is provided on the molding surface (outer surface) of the inner mold 1.

The movable concavo-convex forming member 3 is separate from the inner mold frame 1, and forms a large number of concavities and convexities 5 in a row and alternately on one side surface (outer surface) of a vertically long substrate 6 formed in a substantially L-shape in a front view. It is composed. The opposing movable concavo-convex forming member 3 is opposed to brackets 9, 9 having different heights protruding from the tops of the corners.
Each pair is reciprocally movable by a reciprocating operation device (turn buckle) 10 and detachable from the inner mold 1.

The concrete c is cast into a concrete casting space 4 formed between the movable unevenness forming member 3 provided on the inner mold 1 and the outer mold 2 (see FIG. 3).

When the cast concrete c is solidified, the outer mold 2 is lifted in a direction parallel to the inner mold 1 and the outer mold 2 and is removed from the inner mold 1 (see FIG. 5). . When the outer frame is removed, the movable unevenness forming member 3 and the solidified concrete c rise together and are removed from the inner frame 1 (see FIGS. 5 and 6). When the above-mentioned mold release is completed, the inside of the movable concave / convex forming member 3 becomes empty. Therefore, the reciprocating operation device 10 is operated to move the opposing movable concave / convex operating member 3 in a direction crossing the outer mold frame 2 respectively. In the centripetal direction, and the irregularities 5 are separated from the solidified concrete c (FIGS. 7, 8a,
b).

Next, the outer formwork 2 is raised from the solidified concrete c in a direction parallel to the outer formwork 2 (see FIG. 9).

Thus, as shown in FIG. 1, a product (a PC frame for a building material column) in which the concave portions a are formed in tandem at predetermined intervals at the inner corners is manufactured.

The inner mold 1 used in claim 2 has a rectangular shape in plan view and is hollow. At the four corners of the top plate of the hollow inner form 1, through holes 11 similar in shape to the movable concavo-convex forming member 3 are symmetrically opened.
Is configured to be able to pass through. In addition, through holes 12 having the same shape as the through holes 11 are largely opened in the lower four corners of the peripheral wall of the hollow inner form 1 so that the movable uneven forming member 3 can pass therethrough (see FIGS. 10 and 11). . In addition, pulleys 14 are respectively attached to the upper and lower corners of the four corners of the hollow inner form 1 so as to bridge the flexible connecting strip 8.

The outer mold frame 2 has a rectangular shape in a plan view similarly to the hollow inner mold frame 1, and through holes 13 having the same shape as the through holes 11 are largely formed in four inner corners of the bottom. Are configured to be able to pass (see FIG. 10).

The movable concavo-convex forming member 3 is constituted by connecting a short and long board 6 of an equilateral angle steel shape in a plan view alternately with a flexible interval holding piece 7 by a flexible connecting strip 8 (see FIG. 14). .

The short length substrate 6 is made of a hard synthetic resin, wood, metal, a new material, or the like.
Is made of a flexible material such as thermoplastic soft synthetic resin or soft rubber to form a tube, and the flexible connecting strip 8 is made of a flexible wire such as a piano wire or a wire.

Then, the flexible connecting strip 8 is connected to the short-sized long substrate 6,
The flexible connecting strip 8 is made to penetrate the flexible spacing holding piece 7 and
A stopper (not shown) is provided at a predetermined portion of the
And the like, so that the arrangement interval of the short and long substrates 6 is not disturbed. Thus, a stopper (not shown) directly fixes the short length substrate 6 or the flexible interval holding piece 7 disposed at the end to the flexible connecting strip 8 (adhesion,
Otherwise), it is not what you need.

The means for disposing the movable unevenness forming member 3 on the hollow inner mold 1 includes a short-sized long substrate 6 and a flexible interval holding piece 7 at the molding surface corner (outer surface corner) of the inner mold 1. The short and long board 6 and the space holding piece 7 are arranged in the concrete placing space 4 by placing the flexible connecting strip 8 around the pulley 14 and the upper and short board 6 and the space holding The piece 7 is disposed so as to be housed in the hollow inner form 2 (see FIG. 10).

The concrete c is cast in a concrete casting space 4 formed between the hollow inner form 1 and the outer form 2 (see FIGS. 10 and 12).

When the cast concrete c is solidified, the outer form 2 is raised in a direction parallel to the hollow inner form 2, and at the same time, the solidified concrete c is also raised in the same direction (see FIG. 13).

At the same time as the outer mold frame 2 and the solidified concrete c are raised, the short-sized long substrate 6 of the movable unevenness forming member 3 and the flexible space holding piece 7 are raised, and the through holes 1 are sequentially arranged from the upper member.
1, the outer mold 2 and the solidified concrete c are stored in the hollow inner form 1 at the time when the last short-sized long substrate 6 or the spacing member 7 is separated from the solidified concrete c. The mold is released from the hollow inner mold frame 2 to be in the state shown in FIG.

When the outer formwork 2 and the solidified concrete c are obtained, the outer formwork 2 is raised in a direction parallel to the outer formwork itself as shown in FIG. A product (a PC frame for a pillar of building material) in which a is arranged in tandem at predetermined intervals is manufactured.

In each of the embodiments described above, means for manufacturing a PC form for a pillar of building material as a PC product is described. However, the present invention is not limited to these. For example, a concrete pipe having a circular cross section is manufactured. Applicable to manufacturing means.

[0026]

According to the method of manufacturing a PC product according to the first and second aspects of the present invention, the PC is formed in a direction parallel to the inner mold frame and the outer mold frame (in a direction along the molding surfaces of both mold frames). When the product is to be released from the mold, a PC product in which unevenness is formed in tandem on the inner surface can be efficiently manufactured by a flow operation.

According to the movable unevenness forming member disclosed in the third and fourth aspects, the PC product is demolded in a direction parallel to the inner mold frame and the outer mold frame (direction along the molding surfaces of both mold frames). In this case, it is possible to form the unevenness in the cast concrete in a tandem and reliable manner, and to easily separate the cast concrete from the solidified concrete.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a product manufactured by the manufacturing method of the present invention.

FIG. 2 is a schematic explanatory view showing basic manufacturing means common to claims 1 and 2 of the present invention.

FIG. 3 is a schematic vertical sectional front view showing the manufacturing method of claim 1;

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a schematic explanatory view of the manufacturing method following FIG. 3;

FIG. 6 is a schematic explanatory view of the same method following FIG. 5;

FIG. 7 is a schematic explanatory view of the method following FIG. 6;

8A and 8B are plan views illustrating the operation of the movable unevenness forming member of FIG.

FIG. 9 is a schematic explanatory view of the manufacturing method following FIG. 7 and FIG. 13 of claim 2;

FIG. 10 is a schematic vertical sectional front view showing the manufacturing method of claim 2;

FIG. 11 is a plan view of FIG. 10;

FIG. 12 is a schematic explanatory view of the manufacturing method following FIG. 10;

FIG. 13 is a schematic explanatory view of the same method following FIG. 12;

FIG. 14 is a partially enlarged longitudinal sectional front view of the movable unevenness forming member according to claim 2;

[Description of Signs] 1 ... Inner form 2 ... Outer form 3 ... Movable unevenness forming member 4 ... Concrete casting space 5 ... Irregularity c ... Casting concrete (solid 6) Substrate 7 ... Flexible spacing member 8 ... Flexible connecting strip

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshitaka Sakami 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Toru Ohno 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Jun Nomura 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (56) References JP-A-62-233206 (JP, A) JP-A-62 -176806 (JP, A) JP-A-5-16131 (JP, A) JP-A-6-278115 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B28B 7/00- 7/46 B28B 21/76-21/88

Claims (4)

(57) [Claims] 1. An inner mold frame and an outer mold frame are disposed substantially concentrically, and are movable in a direction parallel to and crossing the inner mold frame and the outer mold frame, and have irregularities on one side surface. The movable concave / convex forming member is disposed on the molding surface of the inner mold with the concave / convex forming surface facing the outer mold, and concrete is placed in the concrete casting space formed between the inner mold and the outer mold. After the cast concrete is solidified, the movable uneven forming member, the solidified concrete, and the outer mold are moved in a direction parallel to the inner mold to remove the mold from the inner mold. A method for manufacturing a PC product, in which a forming member is moved in a centripetal direction in a direction intersecting with an outer mold form and separated from solidified concrete. 2. A movable concavo-convex which is arranged so that a hollow inner mold frame and an outer mold frame are substantially concentric, and is movable in a direction parallel to the inner mold frame and the outer mold frame and in a direction crossing the inner mold frame and the outer mold frame. The forming member is disposed on the molding surface of the hollow inner formwork, concrete is poured into a concrete casting space formed between the inner formwork and the outer formwork, and after the cast concrete solidifies, While moving the solidified concrete and the outer mold in a direction parallel to the hollow inner mold and removing the mold from the inner mold, the movable uneven forming members are sequentially housed in the hollow inner mold from the upper portion of the hollow inner mold. A method for manufacturing a PC product, comprising: 3. A concavo-convex forming member for manufacturing a PC product, wherein a large number of concavities and convexities are alternately formed on one side surface of a single substantially L-shaped vertically long substrate in front view. 4. A P which is formed by alternately connecting a substrate having an approximately equilateral angle steel shape and a short length in a plan view and a flexible interval holding piece by a flexible connecting strip.
An uneven forming member for manufacturing C products.