KR20180118941A - Flame resistant and light rafter for traditional construction and process for preparing the same - Google Patents

Abstract

The present invention relates to a flame-retardant and lightweight rafter for a traditional building such as a hanok (Korean style house) or a temple and a manufacturing method thereof. More particularly, the present invention relates to a flame-retardant and lightweight rafter for a traditional building such as a hanok or a temple which can be customized not only for the construction of a traditional house but also for extension work and maintenance by having durability by maintaining sufficient strength even when a rafter used in a traditional house such as hanok or a temple is made lightweight, and a manufacturing method thereof. According to the present invention, a rafter for a traditional building such as a hanok or a temple can be provided to satisfy all requirements such as durability of appropriate weight and strength, physical properties of flame retardancy, economic efficiency, and the like. The rafter can be provided in a customized manner in accordance with the need for economic efficiency and convenience such as shortening of the manufacturing period, low cost of manufacture, expansion and contraction, maintenance and the like. In addition, since the rafter is manufactured rapidly, the manufacturing process is shortened, and the final processed surface is prevented from approaching pests and the like, thereby providing durability, convenience of use and management, and also imparting classical beauty or providing an additional effect that the wooden pattern or monochrome work can be easily implemented.

Description

FIELD OF THE INVENTION The present invention relates to a flame retardant lightweight rafter for traditional buildings,

The present invention relates to a flame retardant lightweight rafter for traditional buildings such as a hanok or a temple, and more particularly to a rafter used for a traditional house such as a hanok or a temple, Which can be customized not only for the construction of a traditional house but also for the expansion and maintenance of a traditional house, such as a hanok or a temple, and a manufacturing method thereof.

In general, the use of rafters is common in the construction and expansion of traditional houses such as hanok and temples.

Wood, which is a kind of structural material used for building new buildings such as hanok or temple buildings, has been used for a long time and has been replaced by some concrete structural materials.

1, a conventional rafter 10 includes a rafter body 11 having a predetermined length and having a circular cross section. The rafter body 10 is made of concrete, The rafter body 11 is provided with a plurality of reinforcing bars 12 for reinforcement of strength, and a plurality of bending roots 13 protruding from the reinforcing bars 12 are formed on the outer side. The reinforcing bar 12 is a material commonly used to prevent cracks in the concrete structure and to increase the strength of the concrete structure. The bending rods 13 bend and project the reinforcing bars to the rafters 10 It is a structure. Generally, the concrete rafter 10 is embedded with reinforcing bars 12 and bending rods 13.

As shown in FIG. 1, a concrete rafter 10 manufactured by casting concrete on a formwork 14 can obtain a rafter 10 reinforced with reinforcing steel through a proper reinforcing steel reinforcement 12, .

Increasing the weight of rafters (10) reduces transportation, handling and construction, and unnecessarily acts as a weight load on the entire roof structure after construction, thereby weakening the strength of the roof structure.

Korean Patent No. 10-0494263 (May 31, 2005) discloses " a method for construction of a rafter and a side of a hanok and a temple building ". The above technique is to produce a rafter by pouring concrete directly onto the formwork. The cross-sectional shape of the concrete structure is a circular cross-section. It can be used as a rafter structural material through concrete structure with circular cross-sectional shape. However, it is heavy as concrete weight, has a limit to be structurally lightweight, has heavy weight and low workability, and weight load after construction is continuously applied to the structure .

Meanwhile, Korean Patent No. 10-1272270 (Feb. 31, 2013) has attempted to provide a hanok and a temple construction rafter in a lightweight manner. This technique includes a rafter main body 21 formed by curing concrete; And a reinforcing steel bar (23) embedded in the longitudinal direction and reinforcing the rafter body (21), wherein the reinforcing steel bar (23) comprises: a bending root (24) protruding outside the rafter body (21) A styrofoam member 22 buried in the center of the rafter main body 21 along the longitudinal direction for weight and weight reduction; A reinforcing bar 23 embedded in the longitudinal direction along the outside of the styrofoam member 22 to reinforce the rafter body 21; And a bending rope (24) installed outside the rafter body (21) while maintaining an interval along the outside of the styrofoam member (22).

However, although this technique provides a lightweight rafter with adequate strength, it still fails to achieve satisfactory weight reduction due to the use of reinforcing materials and concrete, and it is not only burdensome to manufacture, but also provides customization of rafters There is also a limit.

Korean Patent No. 10-0494263 (May 31, 2005) Korean Patent No. 10-1172522 (Aug. 2, 2012) Korean Patent No. 10-1272270 (May 31, 2013)

The inventor of the present invention has conducted intensive studies to overcome the problems of the prior art accompanying rafters used in the above conventional houses and to provide a rafter capable of satisfying all requirements such as flame retardancy, durability and economy. As a result, As well as the basic requirements such as appropriate strength, flame retardancy and light weight, the produced rafters can be customized according to the needs such as shortening of manufacturing period, economical efficiency such as low cost of production, convenience of new construction, enlargement and maintenance And finally completed the present invention.

Accordingly, an object of the present invention is, in one aspect,

a) cutting the steel foam member into a cylindrical shape having a predetermined diameter;

b) applying a mixture obtained by mixing a flame retardant binder containing a mortar: cement: acrylic resin copolymer in a weight ratio of 1: 0.8-1.2: 0.2-0.6 to the outer circumferential surface of the cylindrical hydrogel foam member to form a primary coating layer;

c) attaching the paper on the primary coating layer;

d) curing the primary coated layer to which the paper has been applied;

e) applying a mixture of the step b) on the paper to form a secondary coating layer;

f) attaching the paper on the secondary coating layer;

g) curing the secondary coating layer to which the paper has been applied;

h) applying the mortar on the above paper to form a tertiary application layer;

i) curing the tertiary application layer; And

and j) flattening the third coated layer, which has been cured, to obtain a flame retardant lightweight rafter for traditional buildings.

Accordingly, an object of the present invention is, in another aspect,

A core member including a steel foam member cut into a cylindrical shape and having a constant diameter;

A mixture of a mortar: cement: a flame retardant binder containing an acrylic resin in a weight ratio of 1: 0.8 to 1.2: 0.2 to 0.6 is applied to an outer circumferential surface of a core part including the cylindrical hydroforming member;

A Hanji layer adhered to the primary coating layer;

A mixture of mortar, cement, and a flame-retardant binder in a weight ratio of 1: 0.8 to 1.2: 0.2 to 0.6; a second coating layer applied to the outer surface of the paper layer;

A Hanji layer adhered to the secondary coating layer; And

And a third coating layer coated on the outer circumferential surface of the paper layer with a mixture of mortar and cement in a weight ratio of 1: 0.8 to 1.2, characterized in that the cured third coating layer is flat Which can be achieved by a flame retardant lightweight rafter for traditional buildings.

According to the present invention, it is possible to provide a rafter for a traditional building such as a hanok or a temple in order to satisfy all requirements such as appropriate weight and strength, durability of flame retardancy and economical efficiency, and to provide an economical and convenient And can be provided in a customized manner according to the need for expansion and contraction, maintenance, and the like. In addition, since the manufacturing process is shortened, the manufacturing process is shortened, and the finished surface is prevented from approaching pests and the like, thereby providing durability, ease of use and management, as well as imparting sophistication, To provide additional effects to enable the user to interact with the device.

1 is a schematic view of a conventional rafter structure;
Fig. 2 is an explanatory view of a conventional rafter manufacturing process; Fig.
3 is a flowchart of a rafter manufacturing process according to an embodiment of the present invention;
4 is a view for explaining a rafter layer according to an embodiment of the present invention;
5 is a view for explaining a rafter according to an embodiment of the present invention;

The present invention, in one aspect,

a) cutting the steel foam member into a cylindrical shape having a predetermined diameter;

b) applying a mixture obtained by mixing a flame retardant binder containing a mortar: cement: acrylic resin copolymer in a weight ratio of 1: 0.8-1.2: 0.2-0.6 to the outer circumferential surface of the cylindrical hydrogel foam member to form a primary coating layer;

c) attaching the paper on the primary coating layer;

d) curing the primary coated layer to which the paper has been applied;

e) applying a mixture of the step b) on the paper to form a secondary coating layer;

f) attaching the paper on the secondary coating layer;

g) curing the secondary coating layer to which the paper has been applied;

h) applying the mortar on the above paper to form a tertiary application layer;

i) curing the tertiary application layer; And

and j) flattening the third coated layer, which has been cured, to obtain a flame retardant lightweight rafter for a traditional building.

According to another aspect of the present invention,

A core member including a steel foam member cut into a cylindrical shape and having a constant diameter;

A mixture of a mortar: cement: a flame retardant binder containing an acrylic resin in a weight ratio of 1: 0.8 to 1.2: 0.2 to 0.6 is applied to an outer circumferential surface of a core part including the cylindrical hydroforming member;

A Hanji layer adhered to the primary coating layer;

A mixture of mortar, cement, and a flame-retardant binder in a weight ratio of 1: 0.8 to 1.2: 0.2 to 0.6; a second coating layer applied to the outer surface of the paper layer;

A Hanji layer adhered to the secondary coating layer; And

And a third coating layer coated on the outer circumferential surface of the paper layer with a mixture of mortar and cement in a weight ratio of 1: 0.8 to 1.2, characterized in that the cured third coating layer is flat To provide a fireproof lightweight rafter for traditional buildings.

Hereinafter, a method for manufacturing a flame retardant lightweight rafter for a traditional building according to the present invention will be described in more detail with reference to the accompanying drawings.

It is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense and that the inventor can properly define the concept of a term in order to describe its invention in the best possible way And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention. Therefore, it should be understood that the embodiments described herein and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and that various equivalents and modifications may be substituted for them at the time of the present application shall.

FIG. 3 is a flow chart of a rafter manufacturing process according to an embodiment of the present invention, FIG. 4 is a view for explaining a rafter layer according to an embodiment of the present invention, and FIG. 5 is a view showing a rafter according to an embodiment of the present invention. Fig.

The present invention has a technical feature in finding a condition in which a material or a structural material including a styrofoam, a cement, a mortar and the like is optimally harmonized so as to exert an optimal function in a state where a lightweight styrofoam is used as a material.

Such lightweight rafters for traditional buildings can be manufactured by the following specific individual steps.

a) Sticho-foam member cutting step

First, the styrofoam 10 is cut into a cylindrical shape having a predetermined diameter as a basic member for realizing weight reduction.

This is to maximize the volume occupied by the styrofoam member to minimize the use of the material or structural material having a load. At the same time, in order to reduce the weight of the rafter in consideration of the light weight property,

Such a styrofoam member can be cut into a certain length and diameter using a CNC (computer wire cutter) and used as a basic member. At this time, the diameter of the cylindrical shape to be cut is not particularly limited, but can be suitably selected and set within a range of usually 50 mm to 500 mm.

b) primary coating layer forming step

Separately, a mixture for reinforcing the strength of the steel foam is formed by mixing the mortar: cement: flame retardant binder at a weight ratio of 1: 0.8-1.2: 0.2-0.6 using a blender or the like.

The binder is excellent in physical properties such as flame retardancy, strength and durability, and is composed of 50 to 80 parts by weight of an acrylic resin copolymer, 5 to 15 parts by weight of tris (2-chloroethyl) phosphate, 5 to 10 parts by weight of talc having an average particle diameter of 100 mesh or less 4 to 10 parts by weight of aluminum silicate, 2 to 7 parts by weight of calcium carbonate, 2 to 5 parts by weight of diatomite powder having an average particle diameter of not more than 100 mesh and 2 to 5 parts by weight of abalone shell powder having an average particle diameter of not more than 100 mesh Which is a mortar binder based on an acrylic resin copolymer.

The acrylic resin copolymer is a generic name of a synthetic resin polymerized from an ester such as acrylic acid or methacrylic acid, and methacrylic acid methyl ester is a typical example. Among them, acrylic acid methyl ester polymer can be mainly used as a main component of an adhesive.

The above tris (2-chloroethyl) phosphate (TCEP), talc, aluminum silicate, calcium carbonate,

The sunlight powder and the abrasive shell powder are components used as a filler imparting flame retardancy, and can provide desirable physical strength and flame retardancy within the set range.

The filler components may be of various particle sizes depending on the application of the flame-retarding composition liquid, but those having an average particle diameter of 10 to 400 탆 can be used.

Mortar and cement can also be used commercially without any restrictions on the market.

Next, the mixture is applied to the outer circumferential surface of a cylindrical styrofoam member previously prepared to a required thickness to form a primary coating layer 20. It is sufficient that the thickness of the applied mixture is as small as possible and that the rafters reach the desired strength.

Therefore, considering the durability of rafters, it is most preferable that the diameter of the lightweight rafter finally produced is 50 to 500 mm, and the total thickness of the entire coated layer is 50 to 200 mm.

c) Step of attaching paper

Then, before the primary coating layer is dried, one or two sheets of paper are adhered to form a layer 30. Good adhesion to the mortar and the fibrous component increase the flexural strength of the rafters to give durability. Since the coating layer contains moisture, the coating layer is directly attached on the coating layer due to its structural characteristics.

d) Curing step

The primary coating layer with the paper is cured in the surrounding environment for 10 minutes to 1 hour to solidify the primary coating layer.

e) Secondary application step

The mixture of step b) is applied again on the cured Hanji layer 30 to form a second coating layer 40. [ In the forming step of the secondary coating layer, the thickness of the coating layer may be the same as or different from that of the primary coating layer.

f) curing step and g) curing step

As in the step c), the paper is immediately adhered to the secondary coating layer to form the paper layer 50, and the secondary coating layer to which the paper is attached is cured in the same manner.

h) tertiary application step

The mortar and the cement are mixed at a weight ratio of 1: 0.8-1.2 and applied on the paper to form the third application layer 60. At this stage, the dry binder described above is not used. Dry bit binders are mainly composed of acrylic component and rough ceramic component, which can interfere with subsequent painting or mono-finishing work. In addition, acrylic resin, which is a main component, causes access to insects such as mosquitoes and insects, And it may cause deterioration of durability. Therefore, the mortar layer forming the final layer can provide various efficiencies by applying without the binder.

i) Curing step

The tertiary application layer is cured in an ambient environment for 1 to 48 hours. At this stage, it may be more desirable to provide moisture intermittently to increase the curing strength.

j) Grinding step

The outer peripheral surface of the third coating layer, which has been cured, is ground so as to be flattened. This step is performed to express wood patterns on the outer surface of rafters or to facilitate mono-etching, and the surface is smoothly ground using a polishing machine or abrasive paper using # 100 to 200 or the like. These polishing conditions are intended to provide a state in which the paint used for the pattern or monochrome is most efficiently coordinated with and adhered to the surface. If the surface roughness is higher than the above-defined range, the paint operation is not suitable or an excessive amount of paint If the surface is excessively smooth, the workability is deteriorated and it may be difficult to perform a precise work.

As shown in FIG. 5, the lightweight rafter for a traditional building according to the present invention may be planarized to flatten a certain area of the upper surface by using a flattening machine or trowel before the hardening progresses, 70 to facilitate the attachment to the upper portion.

At this time, a physical method using a nail, a stopper, or an attaching device may be used, but it is more preferable to monotonously change the outer shape using an adhesive as much as possible.

The lightweight rafter for the traditional building of the present invention manufactured in this way can be used to paint a desired pattern of wood or monotone before and after its attachment to the upper part. By providing the surface as described above, .

The production and curing period of the lightweight rafter is 1 to 5 days in total, and the method according to the present invention is capable of mass production of a lightweight rafter in a short period of time by a very simple process, There is an advantage that it can provide.

<Examples>

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are only intended to further illustrate the present invention and that the scope of the present invention is not limited by these embodiments in accordance with the gist of the present invention.

Example 1: Preparation of Flame Retardant Binder

The steel foam member was wire-cut so as to have a diameter of 130 mm, and then a mixture in which a flame retardant binder containing a mortar: cement: acrylic resin copolymer was mixed at a weight ratio of 1: 1: 0.5 was applied to the outer circumferential surface of the cylindrical steel foam member to a thickness of 3 mm Thereby forming a primary coating layer. The flame retardant binder was prepared by mixing 70 parts by weight of an acrylic resin copolymer, 5 parts by weight of TCEP, 5 parts by weight of talc having an average particle diameter of 100 mesh, 5 parts by weight of aluminum silicate, 5 parts by weight of calcium carbonate, And 5 parts by weight of an abalone shell powder having an average particle diameter of 100 mesh. Then, the paper was cured for about 10 minutes, and then the same mixture was applied to the outer circumferential surface at a thickness of 2 mm to form a second coating layer. Then, the paper was cemented for 10 minutes. Subsequently, a mixture of the same amount of mortar and cement was applied to a thickness of 3 mm, cured for 2 days, and then the surface was leveled using # 180 abrasive paper.

Test Example 1: Adhesion test

A test specimen (test specimen KSF 4918) was prepared using the adhesive composition prepared in Example 1, and the adhesive strength was 32.0 kgf / cm 2. As a result, a strong adhesion was confirmed.

Test Example 2: Flammability test and hazard test

The swalefoot prepared in Example 1 was tested by heating for 20 minutes and the results are shown in Table 1 below.

Test Items result Criteria Test Methods Flammability test 16.5 30% or less KS F 2271 and KS F ISO 1182 and KS F ISO 5660-1 Gas hazard test 19:30 9:00 or more EN ISO 1182

As can be seen from the test results in Table 1, the flame retardant rafter produced according to the present invention was found to satisfy all the requirements of flame retardancy and harmfulness as specified.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Modification is possible. Accordingly, the spirit of the present invention should be understood only in accordance with the following claims, and all equivalents or equivalent variations thereof are included in the scope of the present invention.

10: Styrofoam member 20: First coating layer
30, 50: Hanji layer 40: Second coating layer
60: Mortar layer 70: Planarizing layer

Claims (4)

a) cutting the steel foam member into a cylindrical shape having a predetermined diameter;
b) applying a mixture obtained by mixing a flame retardant binder containing a mortar: cement: acrylic resin copolymer in a weight ratio of 1: 0.8-1.2: 0.2-0.6 to the outer circumferential surface of the cylindrical hydrogel foam member to form a primary coating layer;
c) attaching the paper on the primary coating layer;
d) curing the primary coated layer to which the paper has been applied;
e) applying a mixture of the step b) on the paper to form a secondary coating layer;
f) attaching the paper on the secondary coating layer;
g) curing the secondary coating layer to which the paper has been applied;
h) applying the mortar on the above paper to form a tertiary application layer;
i) curing the tertiary application layer; And
and j) flattening the third coated layer having been cured. The method for manufacturing a lightweight rafter for a traditional building, comprising the steps of: The method according to claim 1,
The flame-retardant binder comprising the acrylic resin copolymer is a copolymer of 50 to 80 parts by weight of an acrylic resin copolymer, 5 to 15 parts by weight of tris (2-chloroethyl) phosphate, 5 to 10 parts by weight of talc having an average particle diameter of 100 mesh or less, 4 to 10 parts by weight of silicate, 2 to 7 parts by weight of calcium carbonate, 2 to 5 parts by weight of anilite powder having an average particle diameter of not more than 100 mesh and 2 to 5 parts by weight of abalone shell powder having an average particle diameter of not more than 100 mesh Wherein the mortar composition is a mortar binder based on a copolymer. The method according to claim 1,
Wherein the lightweight rafter has a diameter of 50 to 500 mm and a total thickness of the first to third coating layers is 5 to 200 mm and the manufacturing and curing period of the lightweight rafter is 1 to 5 days in total A method of manufacturing a lightweight rafter. A core member including a steel foam member cut into a cylindrical shape and having a constant diameter;
A mixture of a mortar: cement: a flame retardant binder containing an acrylic resin in a weight ratio of 1: 0.8 to 1.2: 0.2 to 0.6 is applied to an outer circumferential surface of a core part including the cylindrical hydroforming member;
A Hanji layer adhered to the primary coating layer;
A second coating layer coated with a mixture of mortar: cement: a flame retardant binder containing acrylic resin at a weight ratio of 1: 0.8-1.2: 0.2-0.6 to the outer surface of the paper layer;
A Hanji layer adhered to the secondary coating layer; And
And a third coating layer coated on the outer circumferential surface of the paper layer with a mixture of mortar and cement in a weight ratio of 1: 0.8 to 1.2, characterized in that the cured third coating layer is flat Flame retardant lightweight rafter for traditional buildings.

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