JP2827832B2 - Method of manufacturing embedded concrete formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a concrete buried form having irregularities on the surface of a concrete body and having high integration with the concrete body.

[0002]

2. Description of the Related Art Precast concrete buried formwork is
In the construction of concrete structures, they are used for speeding up the construction, saving labor, and economically. At this time, naturally, it is desired that the concrete structure be as high as possible with the concrete of the main body.

[0003] As a measure to meet this demand, the surface of the buried formwork on the side of the concrete on the main body is made uneven by the following method.

(1) After the concrete is hardened, irregularities are formed by chipping or the like.

(2) Unevenness is formed by exposing the coarse aggregate by a method such as sandblasting at the stage of uncured concrete.

(3) Coarse aggregates are transplanted at the unhardened stage of concrete to form irregularities.

(4) An unevenness is provided on the surface of a dedicated formwork for manufacturing a concrete embedded formwork, and the unevenness is transferred to the surface of the embedded formwork.

[0008]

According to the above-mentioned methods (1) to (3), not only a lot of labor and time are required for the work, but also a concrete buried form having a constant surface shape is constantly manufactured. Is almost impossible. In the case of the above method (4), except for special cases, the surface of the buried formwork on the concrete side of the main body is on the holding formwork side (upper surface side) of the dedicated formwork for manufacturing. If this holding form is made of steel with normal irregularities, the concrete after curing hardly peels off the concrete from the holding form, and the concrete does not enter the recess of the holding form sufficiently. Therefore, the desired degree of unevenness cannot be obtained, and the number of unevenness is unavoidably reduced, and the desired degree of unevenness is secured only at the location of the unevenness. In this case, it is necessary to reduce the number of irregularities in order to secure the degree of irregularities, and to increase the number of irregularities, there is almost no irregularities.

For this reason, the method of (4) makes it possible to constantly produce a concrete buried formwork having a constant surface shape, but the surface shape is buried by the methods of (1) to (3). As a result, it is inferior to the frame and inferior in integration with the main body concrete.

[0010]

Means for Solving the Problems The present invention is intended to improve the method of the above (4), on the surface of the high rigidity formwork uneven surface is small holes drilled in the recess provided, the High rigidity
By vacuum forming using a mold or a mold of the same shape
The surface is molded into the same irregularities as the high rigid formwork,
In addition, a plastic mold having a small-diameter pipe fitted in the small hole of the high-rigidity mold in the concave is used as a holding mold, and the concrete is vibrated into the mold while vibrating in the mold. A method for manufacturing a buried concrete formwork characterized by setting and curing.

The first feature of the holding mold used in the present invention is that it is an overlapped mold formed by laminating a plastic film molded body on the surface of a highly rigid mold. As the high-rigidity formwork, a steel formwork is usually used. It is necessary to provide unevenness of about several mm to 20 mm on the surface of the high-rigidity formwork, and this unevenness processing may be performed by casting or cutting a steel material. The plastic film molded body to be superimposed on this high-rigidity mold is molded by ordinary vacuum molding using a mold having the same shape as the high-rigidity mold, but the high-rigidity mold with irregularities and perforations It is simple and rational to mold by vacuum molding using as a mold.

It is preferable to use a hard material as the plastic film.

A second feature of the holding mold used in the present invention is that a small hole is formed in the concave portion of the high rigidity mold of the stacked mold ,
This small-diameter tube formed in the concave portion of the
This is to provide an escape route for the air that has been fitted into the small hole and that has been wrapped by the concrete upper surface and the holding form when the concrete is poured, and has lost its escape place. By providing this escape path, the concrete poured in can enter the depth of the holding form concave portion as it is vibrated. As a result, even if the unevenness is densely provided on the holding mold, the unevenness is accurately transferred to the concrete surface.

In forming a plastic film molded body, it is necessary to form the plastic film so as to cover not only the uneven portions of the high-rigidity formwork but also the small holes.
You. This is because, if the holding hole is not covered, when the holding form is used, the splash of cement often rises to the small hole of the high-rigidity form and adheres to the inner surface, blocking the small hole. This is because that.

[0015] By using the stacked form of the present invention,
Since the outer high-rigidity formwork is not in direct contact with the concrete, it can be easily removed at the time of demolding, and the inner plastic film molded body has a small adhesive force with the concrete and can be easily peeled off from the hardened concrete. The demolded outer high-rigidity form is repeatedly used with little cleaning, and the inner plastic film molded body is used several times with cleaning.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIGS. 1A and 1B show an example of a stacked mold used in the present invention, wherein FIG. 1A is a perspective view and FIG. 1B is a longitudinal sectional view. In (a), the high-rigidity mold frame 2 and the plastic film molded body 3 that are actually in close contact are illustrated with a slight separation for explanation.

A square quadrangular pyramid-shaped recess 4 is provided on the surface of the high-rigidity mold 2 outside the stacked mold 1 without any gap, and a convex portion is formed except for the concave portion 4, and a small hole 5 is formed at the deepest portion of the concave portion 4. Are perforated. In this example, the concave portion 4 is a regular quadrangular pyramid, but the shape of the concave portion 4 may be a cone, a truncated cone, another pyramid, a truncated pyramid, a cylinder, or a prism. Easy entry of cast concrete, pile form 1
It is preferably a conical shape from the viewpoint of easy peeling.

The plastic film molding 3 inside the lapping frame 1 is formed so that a square quadrangular pyramid-shaped recess 4 is formed without any gap, and a small-diameter tube 5A is formed at the top of the pyramid. When the inner plastic film molded body 3 is brought into close contact with the outer high-rigidity mold 2, the uneven surface of the high-rigidity mold 2 and the inner surface of the small hole 5 are thinly covered with the plastic film molded body 3, and the overlapped mold 1 is formed. It is formed.

FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention.

The reinforcing bars are arranged in the steel mold 6 and the concrete 7 is driven into the steel mold 6, and immediately, the pile form 1 is pressed against the surface of the concrete 7 from above the steel mold 6. Since the concrete 7 is vibrating, the concrete 7 sufficiently enters the concave portion 4 of the stacked form 1. The concrete 7 is cured until it hardens, the high-rigidity form 2 on the outside of the stacked form 1 is released, and the plastic film molded body 3 on the inside is peeled off from the concrete 7. The unevenness of the stacked form 1 is well transferred to the surface of the concrete 7.

[0022]

According to the present invention, it is easy to remove the pressing form used from the concrete surface, and the concrete sufficiently enters the concave section of the pressing form, and the unevenness of the pressing form can be accurately transferred, and the unevenness can be densely formed. Can be provided.

[Brief description of the drawings]

FIG. 1 shows an example of a stacked form used in the present invention,
(A) is a perspective view, (b) is a longitudinal sectional view.

FIG. 2 is a longitudinal sectional view showing an example for implementing the present invention.

[Explanation of symbols]

1. Stacked formwork, 2. High rigidity formwork, 3. Plastic film molded body, 4. Recessed part, 5 ... Small hole, 5A ...
Small-diameter pipe, 6 ... steel formwork, 7 ... concrete.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Shinbo 2-9-1-1, Tobita-shi, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (56) References JP-A-3-247412 (JP, A) JP-A-63-153103 (JP, A) JP-A-4-107103 (JP, A) JP-A-4-45003 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B28B1 / 14 B28B 7/16 B28B 7/34

Claims (1)

(57) [Claims] The present invention relates to a high-rigidity form or a high-rigidity form having a small hole perforated in a concave portion provided on a surface thereof.
The surface is raised by vacuum forming using a mold of the same shape as
Molded into the same irregularities as the rigid formwork, and
Using a laminated form made of plastic film molded bodies with small-diameter pipes that fit into the small holes of a high-rigidity form as a holding form, and placing and hardening concrete in the form while applying vibration to the form A method for producing a buried concrete formwork, characterized by the following.