JP3192008B2 - Method for producing washed concrete product and formwork for production - 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 for producing a washed concrete product and a formwork for the production.

[0002]

2. Description of the Related Art Conventionally, washed flat plates and columns (centrifugal force forming columns)
The molding surface of the steel mold used in the method is made of a smooth surface. This steel form is superior to a wooden form in that it can be used repeatedly for dozens of times, but an alkali swelling type detergent is applied to the smooth surface of the steel form, In the conventional method of softening and swelling the detergent with alkaline water of concrete poured into a mold, and washing the surface of the concrete product formed in the mold with the detergent with jet water, the conventional method uses steel. Since the adhesive strength of the detergent on the smooth surface of the mold frame is weak and the detergent easily flows unsteadily on the smooth surface, the swelling deformation of the detergent is too large depending on the location, and the washing depth becomes large. There is a problem that the washing depth varies.

On the other hand, Japanese Patent Publication No. 4-41884 discloses that
Manufacturing concrete products by centrifugally forming concrete products by adhering a hardening retarder paper to the inner wall of the formwork, washing out the surface of the concrete product in contact with the hardening retarder paper, and removing cement mortar near the surface The method is shown.

[0004]

The method using the hardening retarder paper can solve the problem of the method of applying the washing agent to the steel mold surface, but uses a large amount of disposable hardening retarder paper. In addition, there is a problem that it is not economical, and the work of attaching the curing retarder paper to the inner wall of the mold requires labor and time.

The present invention has been made in view of the above points, and a method and a mold for manufacturing a washed concrete product in which a uniform washing surface can be easily and inexpensively obtained even with a steel mold. It is intended to provide a frame.

[0006]

According to a first aspect of the present invention, there is provided a method for manufacturing a washed concrete product using a washing agent, comprising the steps of: This is a method of manufacturing a washed concrete product in which a fresh agent is applied, a ready-mixed concrete is poured into a mold, and a molding is performed, and a surface of the formed concrete product is washed out.

A second aspect of the present invention is a mold for manufacturing a washed concrete product in which small-diameter detergent-absorbing grooves are provided at a high density on a molding surface of a steel mold.

[0008]

According to the first aspect of the present invention, a plurality of grooves formed in a molding surface in a mold form secure a washing agent adhering force by a washing agent adsorbing action, so that a uniform washing surface is provided on a product. Is obtained.

According to the second aspect of the present invention, since the small-diameter detergent-absorbing groove absorbs the detergent, the adhesive strength of the detergent is ensured even on the molding surface of the steel mold.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings.

FIG. 1 is an enlarged view of one example of a steel mold for producing a washed concrete product or a molding surface member in a mold and constituting a molding surface of the mold. Small-diameter detergent-absorbing grooves 13 are densely and uniformly provided on a forming surface 12 of a flat steel plate 11, and a uniform uneven surface is formed.

For example, the washing agent absorption groove 13 has a thickness 2
Round grooves having a groove diameter of 2 mm and a depth of 1/2 of the plate thickness are regularly arranged on the surface of a flat steel plate 11 mm at a pitch of 2 mm.

FIG. 2 shows a punching metal 12a having a thickness of 1 mm for forming a small-diameter detergent-absorbing groove at a high density on a molding surface of a steel mold. This punching metal 12a is made of existing steel. Install it inside the mold. The punching metal 12a is a molding surface component in which a detergent absorbing groove 13a having a groove diameter of 2 mm is regularly perforated on the entire surface at an interval of 2 mm.

The punching metal 12a may be used as an insole member forming a flush molding surface of the mold at the bottom surface in the steel mold 21, as shown in FIG. It may be used by attaching it to the inner side surface with bolts or the like. In FIG. 3, reference numeral 22 denotes an applied alkaline swelling type detergent (manufactured by Zokei Co., Ltd.), and reference numeral 23 denotes concrete poured into a mold.

Further, the punching metal 12a may be used alone in a steel mold as shown in FIG. 3, or may be used in combination with a thin flat steel plate on the lower surface side.

Further, in a centrifugal force forming form as shown in FIG. 4, a punching metal 12b of the same shape is fixed to an inner peripheral surface of a semi-cylindrical steel form 11b with bolts or the like, so that a forming surface is formed. In addition, a grooved steel mold in which small-diameter detergent-absorbing grooves 13b are uniformly and densely provided can be formed.
By using a pair of the semi-cylindrical grooved molds, a wash-out centrifugal force forming column is manufactured.

As described above, in a steel mold in which small-diameter detergent-absorbing grooves 13, 13a, and 13b are provided on the molding surface at a high density and uniformly, the detergent is applied to the molding surface in the mold. , By casting a ready-mixed concrete in a formwork and performing normal molding or centrifugal force molding, and washing and removing (washing out) the swelling agent swelling part of the concrete product after demolding, the Manufacture washed concrete products such as washed centrifugal columns.

When the washing agent is applied to the molding surface in the mold, small-diameter washing agent absorption grooves 13 and 13a arranged at high density.
, 13b adsorb the washing agent, thereby ensuring the adhesive strength of the washing agent to the molding surface, and in addition, the unstable fluidity of the washing agent is suppressed, so that the thickness of the washing agent hardly varies.

That is, since the viscous detergent is adsorbed by the absorption grooves 13, 13a and 13b and adheres to the molding surface more strongly than when it is adhered only to the smooth surface of the steel formwork, There is little deviation in the amount of detergent attached due to the unstable fluidity of the detergent on the molding surface, and the detergent applied in large amounts depending on the location is absorbed in the absorption groove, so the thickness of the detergent is reduced. Variations are also eliminated.

In particular, in the centrifugal molding form shown in FIG.
Since the washing agent absorbing groove 13b having a small diameter of about mm absorbs and holds the viscous washing agent, it is possible to use a centrifugal force forming frame in the washing agent application method, which was conventionally impossible.

In the illustrated embodiment, the circular detergent-absorbing grooves 13, 13a, 13b are formed at a predetermined pitch. However, the grooves may be formed linearly. For example, a combination of straight grooves like a grid may be formed at high density.

[0022]

According to the first aspect of the present invention, the unstable flowability of the detergent can be suppressed by securing the adhering force of the detergent by the adsorption action of the plurality of grooves, and the molding surface can be improved. Even if there is a variation in the amount of applied detergent, the amount of detergent attached to the large area will be absorbed into the groove, so that the thickness of the applied detergent on the molding surface will be kept constant and the surface of the molded concrete product will be cleaned. It can be washed out uniformly. That is, it is possible to make the product washing surface uniform and improve the quality. Further, this method does not require labor and cost as in the case of the conventional method of applying a curing retarder paper, and can be easily and inexpensively performed in the same process as the conventional washing agent application method.

According to the second aspect of the present invention, even in the case of a steel mold, a predetermined detergent adhering force is secured by the small-diameter detergent-absorbing grooves provided at high density, so that a uniform product can be obtained. A washing surface can be obtained, and unlike a conventional wooden form, a steel form can be used several tens of times, so that cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of an embodiment of a mold for manufacturing a washed concrete product of the present invention.

FIG. 2 is a perspective view showing an example of a punching metal used in the mold.

FIG. 3 is a cross-sectional view showing an example of molding using the punching metal in a mold.

FIG. 4 is a perspective view showing an example in which the punching metal is applied to a centrifugal force forming mold.

[Explanation of symbols]

 11 Steel formwork (flat steel plate) 12 Forming surface 13 Washing agent absorption groove

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hisayuki Matsuo 218-3 Kitajuku, Isayama, Shimodate-shi, Ibaraki Pref. Nihon Concrete Industry Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) B28B 7/00-7/46

Claims (2)

(57) [Claims] 1. A method for manufacturing a washed concrete product using a washing agent, comprising applying a washing agent to a molding surface provided with a large number of grooves in a mold, and flowing the ready-mixed concrete into the mold. A method of manufacturing a washed concrete product, wherein the surface of the formed concrete product is washed out. 2. A mold for manufacturing a washed concrete product, wherein small-diameter detergent-absorbing grooves are provided at a high density on a molding surface of a steel mold.