JPH08150607A - Cement-based cured material casting apparatus and casting method - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a cast-molding apparatus and a cast-molding method for a hardened cement-based material, which enables to obtain a hardened cement-based material with few bubbles and uniform quality. A mold 1 is provided with a cavity 13 for molding a cement-based cured product to be molded between a pair of openable and closable mold pieces, and a cement paste injecting passage 14 communicating with the cavity 13 is provided. There is. Injection path 1 for mold 1
4 is provided with a cement paste press-fitting means 2, and the molding die 1 has a vent hole 1 communicating from the end of the cavity 13 to the outside.
5 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus and a molding method for molding a cement-based cured product having few bubbles and uniform quality by casting.

[0002]

2. Description of the Related Art Conventionally, when a cement-based hardened material such as a cement roof tile is molded, molding is performed in order to improve the fluidity of a molding raw material in a mold and the dispersibility of reinforcing fibers. A method may be adopted in which excess water is contained in the raw material for use and the excess water is removed during molding.

For example, as described in Japanese Utility Model Laid-Open No. 55-58311, it has a vertically movable upper die and a stationary lower die,
In order to fill and pressurize in a low pressure state and to squeeze water, one with a plurality of suction holes on the lower surface of the upper mold,
As described in Japanese Patent No. 3711, there has been proposed an upper mold which can be raised and lowered and a fixed lower mold, which is provided with a large number of suction holes on the lower surface of the upper mold and which is connected to a vacuum blower. There is.

In all of these methods, press forming is performed by supplying a forming raw material containing excess water to an open press forming mold by press forming, and closing the mold to perform press forming. Is a method of squeezing excess water.

However, in cast molding in which a casting mold having a constant cavity volume is used for molding, rapid water squeezing cannot be performed as in press molding. Therefore, when the above method is adopted, There is a problem that the molding time becomes long and the supply of the molding raw material in the vicinity of the opening for pouring the molding raw material of the molding die becomes slow, causing defective molding.

[0006] As a casting method for a cement-based hardened material, which is capable of improving the dispersibility of the synthetic fiber and obtaining a high-strength cement-based hardened material, for example, JP-A-5-
As described in Japanese Unexamined Patent Publication No. 337910, an outer mold made of a rubber material is used, an inner mold provided with an air vent hole is used, and air is vacuumed from the air vent hole, and a molding die is vibrated. A method is known in which the cement paste is poured into the cavity of the molding die from the opening portion while being vibrated by the method described above to perform shaping.

[0007]

However, in the above-mentioned conventional method, when a cured product having a deeply carved decoration or a cured product having a complicated shape is formed, air bubbles may be mixed in the end portion of the product. However, there is a problem that an insufficiently filled portion may occur.

The present invention solves the above-mentioned problems of the prior art and provides a cast-molding apparatus and a cast-molding method for a cement-based hardened material, which is capable of obtaining a cement-based hardened material with few bubbles and uniform quality. It was made for the purpose of doing.

[0009]

According to the present invention, a cavity for molding a cement-based cured product to be molded is provided between a pair of mold pieces that can be opened and closed, and a cement-based paste injection path communicating with the cavity is provided. Cement type hardened material casting molding device provided with a molding die, in which a cement paste press-fitting means is provided in an injection path of the molding die, and the molding die is provided with a vent hole communicating from the end of the cavity to the outside. This is a cast-molding device for hardened cement-based products.

The present invention 2 is a molding die having a cavity for molding a cement-based cured product to be molded between a pair of mold pieces that can be opened and closed, and a cement-type paste injection path communicating with the cavity. Provided is a device for molding a cement-based cured product, in which a cement-based paste press-fitting means is provided in an injection path of a molding die, and a hollow portion is formed inside at least one mold piece of the molding die. This is a cast-molding apparatus for hardened cement-based material, which is provided with a large number of holes that communicate with the inner hollow portion and is capable of sucking the hollow portion from the outside.

A third aspect of the present invention is a method of casting a hardened cementitious material using the molding apparatus of the first aspect of the present invention, which comprises a step of casting a cementitious paste into a casting mold injection channel, and a cementitious paste in the casting channel. Is a method for pouring a cement-based hardened material by press-fitting the cement-based paste into the cavity with a press-fitting means so as to allow the cement-based paste to overflow into the cavity and to fill in the details in the cavity to carry out shape curing.

A fourth aspect of the present invention is a method for casting a cement-based hardened material using the molding apparatus of the second aspect of the present invention, which comprises a step of pouring the cement-based paste into an injection path of a molding die, and suctioning and pouring from a hole. By pressing the cement paste in the passage into the cavity with the press-fitting means,
It is a casting method of a cement-based cured product, which comprises a step of bleeding a cement-based paste into a cavity while filling the details in the cavity while bleeding air.

In the present invention, the cement paste is
Cement, water, and additives that are added as needed, such as synthetic fibers, water reducing agents, silica fume, silica sand, river sand, fly ash, bentonite, sepiolite, wollastonite, calcium carbonate, mica, and blast furnace slag. Are mixed.

The cement refers to a hydraulic material such as Portland cement, alumina cement and blast furnace cement.

In the present invention, as the press-fitting means, a piston rod or the like which can be inserted into the injection passage and pressed can be used. When a piston rod is used, it may be pressed by a pneumatic or hydraulic cylinder device, but may be repeatedly pressed manually.

In the present invention 4, at the time of casting, at least the cavity side of the hole is covered with a filter cloth. As the filter cloth, a woven cloth made of polyethylene, polyester, nylon, polypropylene, or other synthetic fibers and having the same entire structure is used.

[0017]

In the casting molding apparatus of the cement-based hardened material of the present invention 1, the cement-based paste press-fitting means is provided in the injection path of the molding die, and the molding die is provided with the through hole communicating from the end of the cavity to the outside. This allows the air in the cavity to be discharged from the vent hole during molding, and can also be used as a device to mold cement-based paste into the details of the cavity to mold a cement-based cured product with uniform quality without bubbles. it can.

In the casting molding apparatus of the second aspect of the present invention, a cement-based paste press-fitting means is provided in an injection path of a molding die, and a hollow portion is formed in at least one mold piece of the molding die. A large number of vent holes from the mold surface to the inner hollow part are provided so that the hollow part can be sucked from the outside, so that the air in the cavity can be discharged from the vent hole during molding and It can be used as a device for filling a cement paste to the details of the above and molding a cement hardened product having a uniform quality without bubbles.

The method of casting the hardened cementitious material of the third aspect of the present invention comprises the steps of pouring the cementitious paste into the casting channel of the molding die, and press-fitting the cementitious paste in the casting channel into the cavity by the press-fitting means. It is possible to discharge the air in the cavity together with a part of the cement paste from the hole by overflowing the cement paste from the hole and filling the details in the cavity to cure the shape. At the same time, the cement-based paste can be filled and shaped up to the details of the cavity to form a cement-based cured product having uniform quality without bubbles.

The method for casting a hardened cementitious material according to the present invention 4 is the step of casting the cementitious paste into the casting channel of the mold, and the step of sucking the cementitious paste from the vent hole and pressing the cementitious paste in the casting channel into the cavity by means of press-fitting means. By press-fitting the cement paste into the cavity while bleeding the cement paste into the cavity and filling the details in the cavity, the air in the cavity is pressed into It is possible to suck and discharge the cement paste from the inside, and to fill and shape the cement paste to the details of the cavity to form a cement-based cured product having a uniform quality without bubbles.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing an example of an apparatus for casting a cement-based cured product of the present invention 1. In FIG. 1, reference numeral 1 is a molding die, which includes an upper die 11 and a lower die 12. Between the upper mold 11 and the lower mold 12, there is provided a cavity 13 curved in a bowl shape corresponding to the outer surface shape of the cement-based cured product to be molded.

The upper die 11 is made of an ordinary metallic die material, and an injection path 14 is provided so as to penetrate the substantially center thereof and communicate with the cavity 13 from above. An inflow port 141 is provided so that the cement paste can be poured. A press-fitting means 2 composed of a cylinder is provided immediately above the injection passage 14, and the pressure of the piston 21 thereof causes the inflow passage 14 to flow.
Cement-based paste poured into the cavity 13
It is designed so that it can be pressed into.

The upper mold 11 is provided with a through hole 15 penetrating to the outside at a portion corresponding to the upper edge of the cavity 13 which is curved like a bowl. The cement paste poured into the inflow passage 14 is provided in the upper mold 11. When press-fitted into the cavity 13 by the press-fitting means 2, the cement paste 3 is removed from the hole 1
5 so that it overflows from the cavity 13
It is designed so that it can be filled to the smallest details.

The lower die 12 is made of an ordinary metallic die material. If the lower mold 12 is made of a rubber material, when the cement paste is poured into the cavity 13 of the casting mold 1, the vibration given by the vibration device 5 causes the lower mold 12 to expand and contract in the thickness direction.
3 can be uniformly filled with the cement paste, and when demolding from the cement hardened material after shaping and curing, the lower die 12 is elastically deformed to easily demold. It is preferable because there is an advantage that it can be performed. In that case, the mold 1 with the upper mold 11 and the lower mold 12 closed
Is placed on the vibrating device 5, and the vibrating device 5 causes the molding die 1 to vibrate. The vibration condition is 100
~ 600 VPM is preferred.

FIG. 2 is a cross-sectional view showing an example of a casting mold for the hardened cementitious material of the present invention 2. In FIG. 2, reference numeral 3 is a molding die, which includes an upper die 31 and a lower die 32. Between the upper mold 31 and the lower mold 32, there is provided a cavity 33 that curves in a bowl shape corresponding to the outer surface shape of the hardened cementitious material to be molded.

The upper die 31 is made of an ordinary metallic die material, and is provided with an injection path 34 which communicates with the cavity 33 from above so as to pass through substantially the center thereof. Is provided so that the cement paste can be poured thereinto.

A press-fitting means 2 consisting of a cylinder is provided right above the injection path 34, so that the cement paste 2 poured into the inflow path 34 by the pressure of the piston 21 can be press-fitted into the cavity 33. Has been

The lower mold 32 is made of fiber reinforced resin (FRP) and has a hollow portion 321 formed therein, and a large number of holes 322 communicating from the mold surface to the hollow portion 321 inside the hollow mold 321 are provided. Is sucked through the extraction hole 322 by sucking the suction mark with an external suction device.

The hollow part 321 of the lower die 32 is connected to a vacuum suction device (not shown), and the vacuum suction device is capable of performing vacuum suction of about -20 to 70 cmHg through the hole 322. In addition, the punched hole 3 of the lower mold 32
The cavity side of 22 is appropriately covered with a synthetic fiber filter cloth. Further, the molding die 1 in which the upper die 31 and the lower die 32 are closed.
Is preferably placed on the vibrating device 6, and the vibrating device 6 vibrates the molding die 1. The vibration condition is preferably 100 to 600 VPM.

Next, an example of the method of casting the hardened cementitious material of the present invention 3 using the casting mold 1 shown in FIG. 1 will be described with reference to FIG. First, as shown in FIG. 1, the cement paste 4 is injected into the cavity 13 of the molding die 1 from the injection port 141 into the injection path 14, and 200 to 10
Pour at a rate of 00 ml / min.

Next, the cement paste 4 in the injection path 14 is moved to the cavity 1 by the cylinder 21 of the press-fitting means 2.
Press into 3 The press-fitting by the inserting means 2 is 2 to
The reciprocating motion may be repeated at a constant cycle of 0 to 120 times / minute until a constant pressure of 10 Kg / cm is reached. At this time, a part of the cement paste 4 is made to overflow from the hole 15. As a result, the air in the cavity can be discharged together with a part of the cement paste 4 from the vent hole 15, and the cement paste 4 can be filled and shaped down to the details of the cavity 13.

In this state, curing is performed for a certain time under heating and high humidity. Thereafter, although not shown, the mold 1 is released from the mold to obtain a cement-based cured product.

Next, an example of the method of casting the hardened cementitious material of the present invention 4 using the casting mold 3 shown in FIG. 2 will be described with reference to FIG. First, as shown in FIG. 4, the cement paste 4 is poured into the cavity 33 of the molding die 1 from the pouring port 341 into the pouring path 34.

Next, a vacuum suction device is used to draw a hole 322.
Through the vacuum suction of about -20 to 70 cmHg, and the cement paste 4 in the injection path 34 is press-fitted into the cavity 33 by the press-fitting means 2 under the same conditions as above. At this time, the air in the cavity 33 can be discharged by suctioning from the vent hole 322 together with the press-fitting of the cement paste 4, and the cement paste 4 can be filled and shaped up to the details of the cavity 33.

Example 1 To 100 parts by weight of ordinary Portland cement, 5 parts by weight of silica fume was added and mixed by a mixer. To this mixture, 36 parts by weight of water and a water reducing agent containing alkylallyl sulfonate as a main component (manufactured by Kao Corporation: trade name "Mighty 1"
50 ") 0.5 part by weight was added and mixed in a mixer.

To this mixture, 1 part by weight of vinylon fiber (fiber length 4 mm, thickness 1.8 denier) was added as a synthetic fiber, and the mixture was shaken and mixed by a mixer to uniformly disperse the synthetic fiber, A cement paste was obtained. An Omni mixer (capacity: 5 l) manufactured by Chiyoda Technology Co., Ltd. was used as the above mixer.

Using this cement paste, a molding apparatus 1 shown in FIG. 1 was used as a molding apparatus and molded according to the process described with reference to FIG. 3, and cured at 60 ° C. and 90% RH. A cement-based cured product was obtained.

Regarding the obtained cement-based cured product, JI
When the specific gravity was measured according to S Z 8807,
It was 1.70. Further, the bending strength was measured according to JIS A 1408 and found to be 140 kg / cm ² .

Example 2 A cement-based cured product was obtained in the same manner as in Example 1, except that the molding apparatus 3 shown in FIG. 2 was used as the molding apparatus and molding was carried out according to the steps described with reference to FIG. . When the specific gravity of the obtained cement-based cured product was measured in the same manner as in Example 1, it was 1.70. Further, the bending strength was measured in the same manner as in the Example and found to be 165 kg / cm ² .

[0040] As a comparative example forming device, for the use of the molding apparatus is vent hole is not provided, without performing press-fitting by press-fitting device, except that supplied the cementitious paste into the mold cavity, examples A cement-based cured product was obtained in the same manner as in 1. When the specific gravity of the obtained cement-based cured product was measured in the same manner as in Example 1, it was 1.70. When the bending strength was measured in the same manner as in the example, it was 105 kg.
Was / cm ² .

[0041]

EFFECTS OF THE INVENTION Since the cement-cured product casting apparatus of the present invention 1 and 2 has the above-mentioned constitution, it is used as an apparatus for molding a cement-cured material having uniform quality without bubbles. Can be used.

Since the methods of casting the hardened cementitious material of the present invention 3 and 4 have the above-mentioned constitutions, hardened cementitious material having uniform quality without bubbles can be molded.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an apparatus for casting a cement-based cured product of the present invention.

FIG. 2 is a cross-sectional view showing another example of the cast molding apparatus of the cement-based cured product of the present invention.

FIG. 3 is a cross-sectional view illustrating an example of a method of casting a hardened cementitious material of the present invention using the casting apparatus shown in FIG.

FIG. 4 is a cross-sectional view illustrating another example of the method of casting the hardened cementitious material of the present invention using the casting apparatus shown in FIG.

[Explanation of symbols]

 1,3 Molding die 2 Press-fitting means 4 Cement-based paste 11,31 Upper die 12,32 Lower die 13,33 Cavity 14,34 Injection path 15,322 Drain hole

Claims (4)

[Claims] 1. A cement-based cement system, comprising a mold for forming a cement-based cured product to be molded between a pair of mold pieces that can be opened and closed, and a molding die provided with a cement-based paste injection path communicating with the cavity. A cast molding apparatus for a cured product, characterized in that a cement-based paste press-fitting means is provided in an injection path of a molding die, and the molding die is provided with a through hole communicating from the end of the cavity to the outside. Casting equipment for cured products. 2. A cement system comprising a mold provided with a cavity for molding a hardened cement product to be molded between a pair of mold pieces that can be opened and closed, and a mold provided with an injection path for cement paste communicating with the cavity. A casting molding apparatus for a cured product, wherein a cement-based paste press-fitting means is provided in an injection path of a molding die, a hollow portion is formed inside at least one mold piece of the molding die, and a hollow portion inside the molding surface is formed. An apparatus for casting a cement-based hardened material, characterized in that a large number of through holes are provided in the hollow portion, and the hollow portion can be sucked from the outside. 3. A method for casting a hardened cementitious material using the molding apparatus according to claim 1, wherein a step of pouring the cementitious paste into an injection path of a molding die and a means for press-fitting the cementitious paste in the injection path. And a shape-curing process, in which the cement paste is filled into the details of the cavity while overflowing the cement paste into the cavity by press-fitting. 4. A method of casting a hardened cementitious material using the molding apparatus according to claim 2, wherein a step of pouring the cementitious paste into a casting mold injection channel, and a step of sucking the cemented paste from a vent hole and filling the inside of the casting channel. The cement-based paste is characterized by comprising a step of press-fitting the cement-based paste into the cavity by means of a press-fitting means, bleeding the cement-based paste into the details of the cavity while bleeding the cement-based paste into the cavity, and shaping and curing the paste. Method for casting a cured product.