JPH06336766A - Construction of high strength rc column/beam member, and form therefor - Google Patents

Abstract

PURPOSE:To construct a highly fireproof high strength RC column/beam member equipped with neatly finished surface by a method wherein cement composition made up in ceramic-like structure is used as forms for the RC column/beam member. CONSTITUTION:A board-like cement composition, made up in ceramic-like structure by mixing frit with mortar and by burning the mixture, is used as a form 1 for an RC column/beam member. The column/beam is formed by casting high strength concrete 4 into the form made of the cement composition. Then, the form 1 is made to be momnolithic with the high strength concrete 4 as a surface material for the column/beam, and the surface of the column/ beam is formed by the above-mentioned cement composition in ceramic-like structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a high-strength RC column / beam member using the formwork used for construction as the surface material of the RC column / beam member, and a formwork used for the construction. It is a thing.

[0002]

2. Description of the Related Art A conventional RC column / beam member is arranged in the formwork, and then concrete is placed in the formwork to remove the formwork after the concrete is solidified. Further, in the construction using the PC formwork, the PC formwork is left as it is as the surface material even after the concrete is poured.

[0003]

In the RC column / beam member which is normally constructed, there is a problem that the work for removing the formwork is required later and the fire resistance performance is deteriorated when the strength of the concrete is increased. . These problems can be solved to some extent by using PC formwork, but in the case of PC formwork, support work is required, and as with normal construction, except for special buildings such as parking lots and warehouses. Surface finishing is required separately.

With respect to buildings, fire resistance has been demanded as housing and office buildings have become taller and more complex in large cities, and there has been a strong demand for aesthetics of buildings. For this reason, RC columns and beam members have high strength and fire resistance as well as easy construction.
Beautiful surface finishes are being demanded.

The present invention has been conceived in view of the above circumstances, and its purpose is to adopt a cemented cement composition as a form of RC column / beam members, which is the same as when a PC form is used. It is to provide a new high-strength RC column / beam member construction method and construction formwork that can be used for construction, and can solve the problems of surface finish and fire resistance all at once.

[0006]

The features of the present invention according to the above-mentioned object are that a plate-shaped cement composition obtained by mixing frit (glaze) into mortar and firing to make it into a ceramic is used as a frame for RC column / beam members. That is, the high-strength concrete is placed in the formwork of the framed cement composition to form pillars / beams, and the formwork is integrated with high-strength concrete as the surface material of the pillars / beams, and the cement is made into ceramic. The composition is to form the surface of pillars and beams for fireproofing.

The mortar of the above cement composition preferably has a cement / sand ratio of about 1: 2, and 15 to 45% by weight of the cement is mixed in the mortar in an external ratio, and the mortar mixer is used to divide and knead the mixture. Thus, the cement composition can be made into a ceramic by kneading the mixture for a required time and mixing and adjusting the water so that the flow value becomes 125 ± 5, and calcining the mixture at a temperature of 940 ° C. or higher for at least 2 hours.

As the fine aggregate, a kind of feldspar, which is an anti-firestone, is preferable, and a frit having a yield point of 510 to 665 ° C. can be adopted. When silica fume is added as an admixture, the strength tends to increase. . Such a cement composition remarkably increases the compressive and flexural strength due to ceramization. For example, frit (depression points 510-580
The mixing ratio of ° C.) is 10-30% of the cement weight, the firing temperature from 940 to 1,000 ° C., the sintering time 2 hours, the compressive strength 450~650kgf / cm ^2, bending strength 85~95kgf / cm
² and tensile strength of 40 to 55 kgf / cm ² .

The surface of this ceramicized cement composition can be glazed with a glaze such as a metal oxide and then baked, whereby a surface having a glassy luster can be finished. Then, with the surface as the outside, form a frame in the same manner as a normal formwork, arrange the reinforcement in the formwork, and place high-strength concrete (Fc ≧ 600 kg / cm ² ) to integrate it. The high-strength RC column / beam member with a finely finished surface is completed there.

[0010]

[Operation] In the construction method with the above configuration, since the formwork itself has sufficient strength, it is possible to omit the support work when placing concrete. Further, the finished RC pillar / beam member has improved fire resistance due to the cerammed cement composition left as a surface material, has high strength and excellent fire resistance, and has a beautifully finished surface.

[0011]

EXAMPLES In the drawings, 1 is a column form or beam form made of a plate body (40 to 50 mm) of a cementified cement composition, 2
Is column reinforcement, 3 is beam reinforcement, and 4 is high-strength concrete.

FIG. 1 shows the construction of a column member, which is a column bar 2
After the plate body of the cement composition is framed around the pillar formwork 1, high strength concrete 4 is placed in the pillar formwork to form a pillar member and the high strength concrete 4
And the plate of the cement composition used as the pillar form 1 are integrated and left as a surface material as they are. As a result, the surface of the column is formed of the ceramicized cement composition, and the surface of the column is fire-resistant finished due to the fire resistance of itself.

FIG. 2 shows the construction of the beam member. After the plate body of the cement composition is framed in the beam form 1, the beam form 1 is arranged with the beam reinforcement 3 and then the high-strength concrete. Four
While forming a beam member, the high-strength concrete 4 and the plate body of the cement composition used as the beam form 1 are integrated and left as a surface material as they are. As a result, the beam surface is formed of the ceramified cement composition, and the beam surface has a fire resistant finish due to its own fire resistance performance.

Next, an example of the above-mentioned cerammed cement composition will be shown.・ Materials used Cement (C) Ordinary potland cement Fine aggregate (S) Anti-fire stone crushed sand Maximum particle size 0.5 mm Frit (F) C-1207 (trade name) Strain point 510
℃ Silica fume (SI) Water reducing agent (GE) Paric FC1790 (trade name)

・ Distribution water cement ratio W / C = 38-40% Sand cement ratio S / C = 1.25 Frit F / C = 30% Silica fume SI / C = 5% Water reducing agent GE / C = 4%

Specimen prism (2 x 2 x 8 cm)

Baking method: Charge the specimen at an electric furnace temperature of 200 ° C., it takes 2 hours to rise to 1000 ° C., and after it is fired for 2 hours in that temperature range, it is naturally cooled in the furnace to 200 ° C. Take out.

・ Strength Compressive strength 620kgf / cm ² Tensile strength 57kgf / cm ²

[0019]

As described above, the present invention uses a ceramicized plate-like cement composition as a formwork for RC column / beam members, and uses the formwork as a surface material for the column / beam integrated with high-strength concrete. And the surfaces of the pillars and beams are fire-resistant finished, the following effects are achieved.

When the PC member is used as a mold, a separate finish is required, but since the surface has already been finished beautifully by making it into ceramic, the finishing step after concrete placement is omitted, and the work step on site. Since the number is reduced, it is possible to save labor and shorten the construction period.

Since the fire resistance of the surface of the RC pillar / beam member is improved by the cement composition which is made into ceramic, even if the RC pillar / beam member is composed of high strength cement, the fire resistance performance is deteriorated. And the surface strength is increased by making it ceramic, so it has excellent durability and high strength R
C pillar / beam members can be obtained.

In a formwork made of a plate body of a cementified cement composition, since it itself has strength, it is possible to omit support work, and since work of removing and removing the formwork is not required, work after placing concrete Is less and work efficiency is improved.

A glaze such as a metal oxide can be applied to the surface of the ceramicized plate body and baked, and the surface can be finished to have a glassy luster. There is no need to decorate.

[Brief description of drawings]

FIG. 1 is a sectional view of a high-strength RC column member according to a construction method of the present invention.

FIG. 2 is a sectional view of the same high-strength beam member.

[Explanation of symbols]

 1 column form, beam form 2 column reinforcement 3 beam reinforcement 4 high strength concrete

Claims (2)

[Claims] 1. A mortar containing frit mixed and fired to form a ceramic plate-like cement composition in a form of RC column / beam member, and high-strength concrete is placed in the form to form a column. A high strength RC characterized by forming a beam and integrating a formwork with high strength concrete as a surface material for the pillar / beam, and forming the surface of the pillar / beam by the above-mentioned ceramicized cement composition. Construction method for pillar and beam members. 2. A formwork for construction of a high-strength RC column / beam member, characterized by comprising a plate-shaped cement composition obtained by mixing frit into mortar and firing it to form a ceramic.