WO2006098596A1

WO2006098596A1 - Heating system for reducing floor impact sound using heating piping method

Info

Publication number: WO2006098596A1
Application number: PCT/KR2006/000956
Authority: WO
Inventors: Sung-Ha Park; Mun-Sung Bae; Chul-Hwan Kim; Hun-Sung Kang
Original assignee: Lg Chem, Ltd.
Priority date: 2005-03-17
Filing date: 2006-03-16
Publication date: 2006-09-21
Also published as: KR200391011Y1; JP2008533336A; CN101142365A

Abstract

Provided is a heating system for reducing floor impact sound, which is capable of simultaneously satisfying floor heating and reduction of floor impact sound by enabling application of a double bottom having floor impact sound reduction performance to the lower part of the heating system and application of a conventional wet heating method per se to the upper part of the heating system.

Description

HEATING SYSTEM FOR REDUCING FLOOR IMPACT SOUND USING HEATING PIPING METHOD

Technical Field

The present invention relates to a semi-dry heating system. More specifically, the present invention relates to a heating system having floor impact sound-reducing performance via application of a double-bottom system to a lower part of a wet heating layer, and having a slimmer thickness and superior strength via provision of a novel sandwich top plate structure invented by forming elongated grooves on a plate-like material of a top plate of a double-bottom layer and inserting reinforcing materials into the thus-formed elongated grooves, taking into consideration stable supporting of the wet heating layer and the thickness and weight reduction of the entire heating system.

Background Art

In connection with floor heating manners, a wet construction method may provide convenient construction processes and stable sensation of walking on the floor. However, due to lack of floor impact sound-reducing performance, a separate floor impact sound-insulation material (hereinafter, referred to as "sound insulation material") is often additionally laid in the lower part of the heating layer.

In order that such a conventional embedment-type sound insulation material exerts floor impact sound-reducing performance thereof, the heating system should be designed taking into consideration the material characteristics, elasticity and a loss coefficient of the sound insulating material. Therefore, many experts and material makers in the related art have been actively conducting a great deal of research and study on such construction design parameters for a long period of time.

However, when such a sound insulation material is laid down, the heating layer may undergo occurrence of cracks due to cushionability of the sound insulation material installed in the lower part of the heating layer, thereby causing defects of the heating floor. Further, a decrease in durability of the sound insulation material results in failure to withstand the weight of heating layer and therefore shrinkage of the insulating material, which may lead to sagging of the entire heating floor in the worst case.

Further, from the building design standpoint, it is impossible to increase the thickness of the sound insulation material over the predetermined value, and the thickness of the sound insulation material is limited in a narrow range. Therefore, such a thickness is too thin to sufficiently reduce floor impact sound and in fact, it can be said that floor impact sound-reducing effects exerted by such a sound insulation material are very insignificant. Occasionally, application of the sound insulation material may rather reduce floor impact sound-reducing performance.

Meanwhile, Korean Patent Laid-open Publication No. 1995-0018994 discloses a method and apparatus for construction of a floor warming system (Ondol heating system) in apartment houses. According to Ondol structure ("Ondol" is a Korean traditional floor heating system) disclosed therein, concrete slabs and thermal insulation materials are completely filled between the respective support frames and therefore it cannot be expected to achieve desired reducing performance of floor impact sound.

Disclosure Technical Problem

In order to solve the above problems suffered by conventional arts, the inventors of the present invention have made an attempt to impart floor impact sound-reducing performance, which is usually possessed by a double-bottom system, to a wet heating system, via application of the double-bottom system into the wet heating system. That is, the present invention is intended to provide floor impact sound-reducing performance via constitution of the lower part of the heating system into a double-bottom system and to provide stable walking sensation via constitution of the upper part of the heating system into the wet heating layer.

Therefore, it is an object of the present invention to provide a heating system having floor impact sound-reducing performance.

It is another object of the present invention to provide a floor impact sound reduction-type heating system which is capable of realizing a slimmer thickness of the applied double-bottom layer while securing high rigidity and weight reduction thereof and which is also capable of realizing more stable walking sensation while securing broader arrangement intervals of support frames.

It is yet another object of the present invention to provide a floor impact sound reduction-type heating system having high-water resistance by overcoming disadvantages such as dimensional variation and reduced strength caused by moisture.

Technical Solution

hi accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a floor impact sound reduction-type heating system, comprising a double-bottom layer including a plurality of support frames arranged at a regular interval and a top plate placed on the support frames; and a wet heating layer including a thermal insulation material installed on the top plate of the double-bottom layer, a pipe holder installed on the thermal insulation material and fixing heating pipes, heating pipes inserted into the pipe holder and circulating heating fluid, and a mortar layer finishing the upper parts of the heating pipes. The top plate of the double-bottom layer, which is applied to the heating system in accordance with the present invention, includes a plate-like material having one or more elongated grooves and reinforcing materials which are partially or fully inserted into the elongated grooves.

In one preferred embodiment of the present invention, the plate-like material is composed of an upper plate-like material and a lower plate-like material, and one or more elongated grooves are formed on at least one surface of the top and bottom surfaces of the upper plate-like material and the top and bottom surfaces of the lower plate-like material.

According to a first embodiment of the present invention, one or more elongated grooves are formed on the bottom surface of the upper plate-like material or the top surface of the lower plate-like material, and bar-like reinforcing materials, which have a shape conforming to that of the groove, are inserted into the corresponding elongated grooves.

According to a second embodiment of the present invention, one or more elongated grooves are formed on the bottom surface of the upper plate-like material or the top surface of the lower plate-like material, and a plate-like reinforcing material, which was bent conformably to the shape of the elongated groove, is inserted between the upper and lower plate-like materials, wherein the bent parts of the plate-like reinforcing material are inserted into the elongated grooves.

According to a third embodiment of the present invention, one or more elongated grooves are formed on the bottom surface of the upper plate-like material or the top surface of the lower plate-like material, and a plate-like reinforcing material, which was bent conformably to the shape of the elongated groove, is inserted between the upper and lower plate-like materials, wherein the bent parts of the plate-like reinforcing material are inserted into the elongated grooves and bar-like reinforcing materials, which have a shape conforming to that of the elongated groove, are inserted into the bent parts of the plate-like reinforcing material. According to a fourth embodiment of the present invention, one or more elongated grooves are formed on the bottom surface of the upper plate-like material and the top surface of the lower plate-like material, and a bar-like reinforcing material, which has a shape conforming to that of an elongated coupling groove formed upon coupling of the upper and lower plate-like materials, is inserted into the corresponding elongated coupling grooves.

According to a fifth embodiment of the present invention, one or more elongated grooves are formed on the bottom surface of the upper plate-like material and the top surface of the lower plate-like material, and one or more plate-like reinforcing materials, which are bent conformably to the shape of an elongated coupling groove formed upon coupling of the upper and lower plate- like materials, are inserted between the upper and lower plate-like materials, wherein the bent parts of the plate-like reinforcing materials are inserted into the elongated coupling grooves.

According to a sixth embodiment of the present invention, one or more elongated grooves are formed on the bottom surface of the upper plate-like material and the top surface of the lower plate-like material, and one or more plate-like reinforcing materials, which were bent conformably to the shape of an elongated coupling groove formed upon coupling of the upper and lower plate- like materials, are inserted between the upper and lower plate-like materials, wherein the bent parts of the plate-like reinforcing materials are inserted into elongated coupling grooves, and bar-like reinforcing materials, which have a shape conforming to that of the elongated coupling groove, are inserted into the bent parts of the plate-like reinforcing materials. hi another embodiment of the present invention, the plate-like material is composed of a single plate-like material, and one or more elongated grooves are formed on the bottom surface of the plate-like material.

According to a seventh embodiment of the present invention, the bar- like reinforcing materials having a shape conforming to that of the elongated groove are inserted into the corresponding elongated grooves. According to an eighth embodiment of the present invention, a plate-like reinforcing material, which was bent conformably to the shape of the elongated groove, is inserted into the bottom surface of the plate-like material, wherein the bent parts of the plate-like reinforcing material are inserted into elongated grooves. According to a ninth embodiment of the present invention, a plate-like reinforcing material, which was bent conformably to the shape of the elongated groove, is inserted into the bottom surface of the plate-like material, wherein the bent parts of the plate-like reinforcing material are inserted into elongated grooves and the bar-like reinforcing materials having a shape conforming to that of the elongated groove are inserted into the bent parts of the plate-like reinforcing material.

In the present invention, the shape of the elongated groove and reinforcing material may be triangular, tetragonal, circular or elliptical shape, or any combination thereof, as viewed from the longitudinal section thereof. The bar-like reinforcing material used in the present invention may be an aluminum bar, a steel bar and a high-strength plastic bar such as FRP (Fiber Reinforced Plastic). The preferred bar-like reinforcing material is an aluminum bar.

The plate-like reinforcing material that can be used in the present invention may include, for example a zinc-galvanized steel sheet and a common steel sheet. Preferred is the zinc-galvanized steel sheet.

The top plate of the double-bottom layer, which is applied to the heating system according to the present invention, may be composed of a plate-like material alone, without incorporation of any reinforcing material. As the material for the plate-like material utilized in present invention, there may be used single materials, for example, including wood-based materials such as particle board (PB), plywood, medium density fiberboard (MDF), high density fiberboard (HDF) and oriented strand board (OSB), inorganic-based materials such as wood wool cement board (WWCB) and concrete cement board, synthetic resin-based materials, steel-based materials and aluminum-based materials, or composite materials simultaneously using two or more materials, for example the wood-based materials and aluminum. Upon taking into consideration rigidity versus the purchasing cost, and processability, the wood- based materials are preferred. In particular, the preferred plate-like materials are PB, plywood, MDF, OSB and inorganic boards. Taking into account the load of the wet heating layer which is constituted on the upper part of the double-bottom layer, the wood wool cement board can be used so as to achieve enhanced rigidity for stable supporting of the heating layer.

The total thickness of the top plate of the double-bottom layer composed of the upper and lower plate-like materials and reinforcing material is preferably in the range of 20 to 70 mm. The thickness of the reinforcing material is preferably in the range of 3 to 20 mm. When the thickness of the top plate and reinforcing material is too thin, it is impossible to achieve desired strength thereof. To the contrary, when the thickness of the top plate and reinforcing material is too thick, their own loads and the cost of materials will be increased.

According to the preferred embodiment of the present invention, the plate-like material is coated with a waterproof composition composed of 22 to 60% by weight of an acrylic resin, 5 to 30% by weight of a water repellent, 3 to 20% by weight of a hydrogenated rosin, 0.5 to 5% by weight of a penetrant, 2 to 8% by weight of an additive and 1 to 15% by weight of a high-boiling point solvent.

Commercially available waterproof agent may include, for example vinyl acetate-based emulsions. As specific kinds of the vinyl acetate-based emulsions, mention may be made of copolymers such as vinyl acetate homopolymers, acrylic vinyl acetate and vinyl acetate VeoVa, and ethylene vinyl acetate. These vinyl acetate-based emulsions do not use surfactants and therefore exhibit excellent initial adhesivity and water resistance. However, due to use of water-soluble polymers, which is accompanied by high viscosity, these emulsions also disadvantageous^ suffer from difficulty in coating thereof. In addition, such emulsions have a large particle size which results in easy passage of water molecules through the space between particles, thereby facilitating penetration of moisture. Therefore, due to high water penetrability occurring upon exposure to moisture for an extended period of time, they are primarily used for building interior application and are unsuitable for application to plate-like materials such as PBs.

According to the present invention, in order to solve the problems suffered by commercially available waterproof agents, a waterproof composition utilizing resin and wax, having a small particle size, and other additives is coated to be penetrated into the plate-like materials such as PBs, thereby achieving stabilization of the plate-like materials. The plate-like materials coated with the waterproof composition of the present invention exhibit superior weatherability and durability without occurrence of distortion and can also block release of formalin which is used in manufacturing of the plate-like materials.

For stabilization of the plate-like material, it is preferred that the acrylic resin used in the present invention has a smaller particle size. Specifically, the particle size of the acrylic resin is preferably in the range of 0.1 to 0.5 (m. Except for a particular case, the acrylic emulsion resin is formed to have a particle size in the range of 0.1 to 1.5 μm. When the particle size of the emulsion resin is greater than 1.5 IM, the content of the emulsion resin remaining on the coating surface of the adhered material, upon coating, is greater than the penetration amount. Conversely, when the particle size of the emulsion resin is less than 0.1 IM, the penetration amount of the emulsion resin is greater than the content remaining on the coating surface of the adhered material.

The acrylic resin that can be used in the present invention may include, for example water-soluble acrylic resins, styrene maleic anhydride copolymer (SMA) resins, acrylic hybrid emulsions and urethane hybrid resins. In particular, the water-soluble acrylic resins are preferred which become highly water-resistant upon evaporation of water.

The water repellent that can be used in the present invention may include, for example polyethylene (PE) wax, polypropylene (PP) wax, paraffin wax, fluorine-based water repellents and silicon-based water repellents, hi the case of paraffin wax or PE wax, if a softening point thereof is low, stability of the coated surface and inside is poor. Therefore, it is preferred to use wax having a high softening point, if possible. The preferred softening point is in the range of 80 to l lO^°C . The hydrogenated rosin used in present invention serves to reinforce adhesivity and waterproofhess of wood parts. For example, there may be used ester gum rosins, terpene phenolic resins, petroleum resins, hydrocarbons and synthetic resin emulsions. The penetrant that can be used in the present invention may include, for example anionic surfactants such as sodium alkyl esters, naphthalene sulfonates, phosphates and nonyl phenyl alkyls.

The high-boiling point solvent used in present invention serves to strengthen the surface of the coated film and facilitate easy workability, and may include, for example ethylene glycol, propylene glycol and diethylene glycol.

The additive solvent that can be used in present invention may include, for example a leveling agent and a wet dispersant. The utilizable leveling agent includes, for example BYK-348 (BYK Chemie), and the utilizable wet dispersant includes, for example BYK- 190 (BYK Chemie) and Dispers 610S (TegoChemie). In order to prepare materials involved in cohesion and adhesion or coating, there are required multi-component materials, not single component materials. In this case, the respective components have physicochemical effects on the finished products and as a result, there are numerous parameters according to the composition ratio between the respective components. Upon considering such probable adverse effects, the composition ratio between the acrylic resin, water repellent, hydrogenated rosin, penetrant, additive and high-boiling point solvent, which constitute the waterproof composition of the present invention, should be in the optimal numerical range.

Description of the Drawings

The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. 1 is a schematic cross-sectional view of a floor impact sound reduction-type heating system in accordance with the present invention;

FIG. 2 is a cross-sectional view of a double-bottom layer in accordance with one embodiment of the present invention;

FIG. 3 is an exploded plan view of a top plate of a double-bottom layer in accordance with one embodiment of the present invention; FIG. 4 is a cross-sectional view of a top plate of a double-bottom layer to which a bar-like reinforcing material is applied in accordance with a variety of embodiments of the present invention;

FIG. 5 is a cross-sectional view of a top plate of a double-bottom layer to which a plate-like reinforcing material is applied in accordance with a variety of embodiments of the present invention; and

FIG. 6 is an interior cross-sectional view of a bar-like reinforcing material having various structures, which is applied to a top plate of a double- bottom layer of the present invention.

Best Mode

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional view of a floor impact sound reduction-type heating system in accordance with the present invention. As shown in FIG. 1, the heating system of the present invention is comprised of a double-bottom layer 10 constituted on the lower part of the heating system and a wet heating layer 40 constituted on the upper part thereof. The double-bottom layer 10 is composed of a plurality of support frames

30 arranged at a regular interval and a top plate 20 placed on the support frames 30.

The wet heating layer 40 is a wet heating system which is generally used in Ondol heating system for residential houses. The wet heating layer 40 is composed of a thermal insulation material 41 installed on the top plate 20 of the double-bottom layer 10, pipe holders 42 installed on the thermal insulation material 41 and fixing heating pipes 43, the heating pipes 43 inserted into the pipe holders 42 and circulating heating fluid, and a mortar layer 44 finishing the upper parts of the heating pipes 43. The thermal insulation material 41 serves to increase heating efficiency of the heating system by blocking downward transfer of heat radiated from the heating pipes 43. As the suitable thermal insulation material that can be used in the present invention, mention may be made of expandable polystyrene (EPS) and the like. The pipe holders 42 serve to fix the heating pipes 43, and are composed of plural ring-shaped insertion parts into which the heating pipes 43 are inserted and fixed therein and support plates for supporting the insertion parts. Taking into account various arrangement forms of the heating pipes 43 and convenience of piping work, the structure of the insertion part may be altered in the form of a lattice or groove.

The heating pipes 43 serve to uniformly circulate heating fluid such as hot water throughout the entire heating area. The heating pipe may be formed of a PB (polybutylene) pipe, a PPC (polypropylene copolymer) pipe, an XL (crosslinked) pipe or a PE-RT (polyethylene raised temperature) pipe. The mortar layer 44 is a layer for finishing the wet heating layer 40 by kneading cement and sand using water and pouring the kneaded mixture over the entire heating area to cover the heating pipes 43, followed by curing.

FIG. 2 is a cross-sectional view of a double-bottom layer 10 to which a top plate 20 in accordance with one embodiment of the present invention is applied. In the present invention, via application of a high-strength sandwich top plate as the top plate 20, the respective support frames 30 may be disposed at an arrangement interval of at least 400x400 mm, for example 600x600 mm, 900x900 mm, 800x1,200 mm, 1,200x1,200 mm or 1,200x1,800 mm. Therefore, it is possible to accomplish improved construction speed, and cost reduction due to decreased numbers of support frames 30 to be used.

The support frame 30 used in the double-bottom layer 10 is generally composed of a head, a height-adjusting bolt and a support rubber pad. Specifically, the support frame 30 is provided with a plate-like head including a nut inserted into a central part thereof and supporting the top plate of the double- bottom layer; a bolt having a straight (I)-shaped or a cross (+)-shaρed groove formed on the top thereof and adjusting a height of the head via engagement with the nut; and a support rubber pad having a bolt-supporting groove being capable of rotatably supporting the bolt formed on the upper part thereof.

In order to reduce vibration transfer while absorbing an impact force transmitted to the bottom, the support rubber pad is preferably formed of a vibration-damping material such as a non-elastic rubber. In addition, the support rubber pad may take various shapes, for example a cylindrical shape that is advantageous to withstand heavy load, a reverse trapezoidal shape capable of obtaining stability, and an embossed structure to obtain floor impact sound- reducing performance. FIG. 3 is an exploded plan view of a top plate 20 for a double-flooring material in accordance with one embodiment of the present invention, wherein the top plate 20 is composed of the upper plate-like material 21 and lower plate-like material 22 and the bar-like reinforcing materials 23 inserted between elongated grooves formed thereon. The bar-like reinforcing materials 23 are inserted into the elongated tetragonal grooves which are formed on the bottom surface of the upper plate-like material 21 and the top surface of the lower plate-like material 22, in the longitudinal direction of short sides of the plate-like materials 21 and 22.

In order to achieve weight reduction of the top plate 20, the bar-like reinforcing materials 23 preferably use an aluminum bar having an empty or hollow structure or having recessed portions at one side thereof. In order to secure high strength of the top plate 20, the bar-like reinforcing material 23 is preferred to have one or more ribs which are formed therein parallel to the longitudinal direction. FIG. 4 is a cross-sectional view of a top plate 20 of a double-bottom layer to which a bar-like reinforcing material 23 is applied in accordance with a variety of embodiments of the present invention.

A first top plate 20a of FIG. 4 has a structure in which four elongated tetragonal grooves are formed on the bottom surface of the upper plate-like material 21a and the top surface of the lower plate-like material 22a, respectively, and four tetragonal bar-like reinforcing materials 23, which have a shape conforming to that of an elongated tetragonal-coupling groove formed upon coupling between the upper and lower plate-like materials 21a and 22a, are inserted into the corresponding elongated tetragonal-coupling grooves. The respective elongated grooves, which were symmetrically and oppositely formed on the corresponding sides of the upper and lower plate-like materials 21a and 22a, equally share halves of the bar-like reinforcing materials 23.

A second top plate 20b of FIG. 4 has a structure in which four elongated tetragonal grooves are formed only on the top surface of the lower plate-like material 22b, without formation of grooves on the bottom surface of the upper plate-like material 21b, and four tetragonal bar-like reinforcing materials 23, which have a shape conforming to that of an elongated tetragonal groove, are inserted into the corresponding elongated tetragonal grooves.

A third top plate 20c of FIG. 4 consists of only one plate-like material, and has a structure in which four elongated tetragonal grooves are formed on the bottom surface of the plate-like material, and four tetragonal bar-like reinforcing materials 23, which have a shape conforming to that of an elongated tetragonal groove, are inserted into the corresponding elongated tetragonal grooves.

FIG. 5 is a cross-sectional view of a top plate 20 of a double-bottom layer to which plate-like reinforcing materials 24 and 25 are applied in accordance with a variety of embodiments of the present invention.

A first top plate 2Od of FIG. 5 has a structure in which four elongated tetragonal grooves are formed on the bottom surface of the upper plate-like material 21a and the top surface of the lower plate-like material 22a, respectively, and the upper and lower plate-like reinforcing materials 24d and 25d, which were bent conformably to the shape of an elongated tetragonal coupling groove formed upon coupling between the upper and lower plate-like materials 21a and 22a, are inserted between the upper and lower plate-like materials 21a and 22a, wherein the tetragonal bent parts of the plate-like reinforcing materials 24d and 25d are inserted into the elongated tetragonal coupling grooves, and four tetragonal bar- like reinforcing materials 23, which have a shape conforming to that of an elongated tetragonal coupling groove, are inserted into the tetragonal bent parts of the upper and lower plate-like reinforcing materials 24d and 25d. Here, the respective elongated tetragonal grooves, which are symmetrically and oppositely formed on the corresponding sides of the upper and lower plate- like materials 21a and 22a, and the tetragonal bent parts of the upper and lower plate-like reinforcing materials 24d and 25d equally share halves of the tetragonal bar-like reinforcing materials 23.

A second top plate 2Oe of FIG. 5 has a structure in which four elongated tetragonal grooves are formed on the bottom surface of the upper plate-like material 2 Ie, without formation of grooves on the lower plate-like material 22e, and the upper plate-like reinforcing material 24e, which was bent conformably to the shape of the elongated tetragonal groove, is inserted between the upper and lower plate-like materials 21e and 22e, wherein the tetragonal bent parts of the upper plate-like reinforcing material 24e are inserted into elongated tetragonal grooves, and four tetragonal bar- like reinforcing materials 23, which have a shape conforming to that of the elongated tetragonal groove, are inserted into the tetragonal bent parts of the upper plate-like reinforcing material 24e.

A third top plate 2Of of FIG. 5 has a structure in which four elongated tetragonal grooves are formed on the bottom surface of the upper plate-like material 2 Ie, without formation of grooves on the lower plate-like material 22e, and the upper plate-like reinforcing material 24e, which was bent conformably to the shape of the elongated tetragonal groove, is inserted between the upper and lower plate-like materials 21e and 22e, wherein the tetragonal bent parts of the upper plate-like reinforcing material 24e are inserted into elongated tetragonal grooves and no tetragonal bar-like reinforcing materials 23 are included.

Even though tetragonal shapes of the elongated groove and reinforcing material were exemplified in the drawings, the shape of the elongated groove and reinforcing material may be embodied in many different forms including circular, elliptical, triangular shape and the like, or any combination thereof.

FIG. 6 is an interior cross-sectional view of a bar-like reinforcing material 23 having various structures, which is applied to a top plate 20 of a double-bottom layer of the present invention.

According to one embodiment of the present invention, in order to achieve weight reduction of the top plate, the bar-like reinforcing material is an aluminum bar whose interior is vacant. Preferably, in order to secure high rigidity of the top plate, the bar-like reinforcing material has one or more ribs formed therein parallel to the longitudinal direction.

The preferred rib structure has a structure in which, as viewed from the longitudinal section cut in the width direction, two triangular or semicircular members, extending in the width direction, are connected with a vertical member positioned at the central part while being vertically opposite to each other, or consists of a long vertical member in which the entire width is constant.

According to another embodiment of the present invention, the bar-like reinforcing material is an aluminum bar having a hollow structure. Here, the hollow structure has a monolayer or multilayer structure composed of one or more elliptical, semicircular, circular or tetragonal hollows.

According to yet another embodiment of the present invention, the bar- like reinforcing material is an aluminum bar having one or more recessed portions at one side thereof.

Mode for Invention

EXAMPLE A heating system having a structure as shown in FIG. 1 was constituted, but the lower part thereof was constituted to have a structure of a double-bottom layer 10 as shown in FIG. 2. A top plate 20 having a structure as shown in FIG. 3 was constructed using particle boards having a thickness of 18 mm as upper and lower plate-like materials 21 and 22, and four tetragonal aluminum bars having a rib structure which has a dimension (unit: mm) as indicated in FIG. 6, as a bar- like reinforcing material 23.

First, elongated tetragonal grooves were formed respectively at four points on the bottom surface of the upper plate-like material 21 and the top surface of the lower plate-like material 22 in the longitudinal direction of short sides thereof, and aluminum bars were then inserted into respective elongated grooves, followed by adhesion and pressing to prepare a top plate 20 having a thickness of 36 mm.

Next, a wet heating layer 40 was constructed as follows. As a thermal insulation material, expandable polystyrene (EPS) layer 41 having a thickness of 10 mm was laid down on the top plate 20 of the double-bottom layer 10. Pipe holders 42 having ring-shaped insertion parts were installed on the thermal insulation material 41, and XL pipes 43 having a nominal diameter of 15 mm were fixed to the pipe holders 42 while being arranged in the form of U-shape in a serpentine fashion, followed by finishing with a mortar layer 44 having a thickness of 40 mm.

Table 1 below shows the comparison results of sagging amounts (load- carrying performance) between the top plate of the double-bottom layer according to the present invention (Example), as constructed above and the top plate without formation of elongated grooves on the plate-like material and with simple stacking of reinforcing materials between the upper and lower plate-like materials (Comparative Example). Here, sagging was measured by applying a load of 100 kg to the central part of the top surface of the top plate at a pressure diameter of 080 and reading graduations on a measuring gauge installed under the products. As can be confirmed from Table 1 below, the top plate of Example exhibited a slimmer thickness and superior rigidity as compared to the top plate of Comparative Example.

[Table 1]

In addition, application of the high-strength top plate 20 enabled the support frames 30 to be arranged at a broad interval up to 800 x 1,200 in the double-bottom layer 10 as shown in FIG. 2, and floor impact sound-reducing performance (practice standards: KS F 2810-2, evaluation standards: KS F 2863- 2) was also a satisfactory level of 45 dB(A).

Meanwhile, a waterproof composition of the present invention was prepared according to the composition formula given in Table 2 below. When a particle board had a waterproof coating applied with the thus-prepared waterproof composition, % thickness swelling was significantly decreased from 10.13% before coating to 4.34% after coating, thus confirming superior water resistance.

Table 2

[Table 3]

Industrial Applicability A heating system of the present invention can provide superior floor- walking sensation to people familiar with hard-floor culture of the room such as Ondol heating system as well as floor impact sound-reducing effects of double flooring materials, via application of the double flooring materials in order to reduce floor impact sound and construction of a wet heating layer thereon, so that a conventional mortar cement heating layer can be applied without particular limitation and modification.

Further, via realization of a slimmer thickness of the double-bottom layer constituted on the lower part of the heating system, in conjunction with high rigidity and weight reduction thereof, taking into consideration weight and thickness of the wet heating layer constituted on the upper part of the heating system, it is possible to stably support the wet heating layer and maintain the thickness of the entire heating system at a predetermined level. For this purpose, formation of elongated grooves on the plate-like material of the top plate for the double flooring material and insertion of bar-like and/or plate-like reinforcing materials into the elongated grooves enable achievement of high rigidity and weight reduction of the top plate in conjunction with a slim thickness thereof. Therefore, it is possible to secure superior walking sensation and broader arrangement intervals of support frames. Further, the present invention provides advantageous effects capable of accomplishing weight reduction of the top plate and at the same time, improved construction speed and cost reduction via an arrangement interval of support frames broader than conventional double-bottom system, in conjunction with a satisfactory level of floor impact sound-reducing effects, In addition, according to the present invention, it is possible to provide a highly water-resistant top plate of the double-flooring material by overcoming disadvantages such as dimensional variation and reduced strength due to moisture, via waterproof coating of the plate-like materials with a special waterproof composition. Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

1. A floor impact sound reduction-type heating system, comprising: a double-bottom layer including a plurality of support frames arranged at a regular interval and a top plate placed on the support frames; and a wet heating layer including a thermal insulation material installed on the top plate of the double- bottom layer, a pipe holder installed on the thermal insulation material and fixing heating pipes, heating pipes inserted into the pipe holder and circulating heating fluid, and a mortar layer finishing the upper parts of the heating pipes.

2. The heating system according to claim 1, wherein the top plate of the double-bottom layer includes a plate-like material having one or more elongated grooves and a reinforcing material which is partially or fully inserted into the elongated grooves.

3. The heating system according to claim 2, wherein the plate-like material is composed of an upper plate-like material and a lower plate-like material, and one or more elongated grooves are formed on at least one surface of the top and bottom surfaces of the upper plate-like material and the top and bottom surfaces of the lower plate-like material.

4. The heating system according to claim 3, wherein one or more elongated grooves are formed on the bottom surface of the upper plate-like material or the top surface of the lower plate-like material, and a bar-like reinforcing material, which has a shape conforming to that of the elongated grooves, is inserted into the corresponding elongated grooves.

5. The heating system according to claim 3, wherein one or more elongated grooves are formed on the bottom surface of the upper plate-like material or the top surface of the lower plate-like material, and a plate-like reinforcing material, which is bent conformably to the shape of the elongated grooves, is inserted between the upper and lower plate-like materials, wherein bent part of the plate-like reinforcing material is inserted into the elongated grooves.

6. The heating system according to claim 3, wherein one or more elongated grooves are formed on the bottom surface of the upper plate-like material or the top surface of the lower plate-like material, and a plate-like reinforcing material, which is bent conformably to the shape of the elongated grooves, is inserted between the upper and lower plate-like materials, wherein bent part of the plate-like reinforcing material is inserted into the elongated grooves and a bar-like reinforcing material, which has a shape conforming to that of the elongated grooves, is inserted into the bent part of the plate-like reinforcing material.

7. The heating system according to claim 3, wherein one or more elongated grooves are formed on the bottom surface of the upper plate-like material and the top surface of the lower plate-like material, and a bar-like reinforcing material, which has a shape conforming to that of an elongated coupling groove formed upon coupling of the upper and lower plate-like materials, is inserted into the corresponding elongated coupling grooves.

8. The heating system according to claim 3, wherein one or more elongated grooves are formed on the bottom surface of the upper plate-like material and the top surface of the lower plate-like material, and one or more plate-like reinforcing materials, which are bent conformably to the shape of an elongated coupling groove formed upon coupling of the upper and lower plate- like materials, are inserted between the upper and lower plate-like materials, wherein bent parts of the plate-like reinforcing materials are inserted into the elongated coupling grooves.

9. The heating system according to claim 3, wherein one or more elongated grooves are formed on the bottom surface of the upper plate-like material and the top surface of the lower plate-like material, and one or more plate-like reinforcing materials, which are bent conformably to the shape of an elongated coupling groove formed upon coupling of the upper and lower plate- like materials, are inserted between the upper and lower plate-like materials, wherein bent parts of the plate-like reinforcing materials are inserted into the elongated coupling grooves, and a bar-like reinforcing material, which has a shape conforming to that of the elongated coupling grooves, is inserted into the bent parts of the plate-like reinforcing materials.

10. The heating system according to claim 2, wherein the plate-like material is composed of a single plate-like material, and one or more elongated grooves are formed on at least one surface of the top and bottom surfaces of the plate-like material.

11. The heating system according to claim 10, wherein a bar-like reinforcing material having a shape conforming to that of the elongated grooves is inserted into the corresponding elongated grooves.

12. The heating system according to claim 10, wherein a plate- like reinforcing material, which is bent conformably to the shape of the elongated grooves, is inserted into the bottom surface of the plate-like material, wherein bent part of the plate-like reinforcing material is inserted into the elongated grooves.

13. The heating system according to claim 10, wherein a plate-like reinforcing material, which is bent conformably to the shape of the elongated grooves, is inserted into the bottom surface of the plate-like material, wherein bent part of the plate-like reinforcing material is inserted into the elongated grooves and a bar-like reinforcing material having a shape conforming to that of the elongated grooves is inserted into the bent part of the plate-like reinforcing material.

14. The heating system according to any one of claims 2 to 13, wherein the shape of the elongated grooves and reinforcing material is triangular, tetragonal, circular or elliptical shape, or any combination thereof, as viewed from the longitudinal section thereof.

15. The heating system according to any one of claims 4, 6, 7, 9, 11 and 13, wherein the bar-like reinforcing material is an aluminum bar, a steel bar or a high-strength plastic bar.

16. The heating system according to any one of claims 5, 6, 8, 9, 12 and 13, wherein the plate-like reinforcing material is a zinc-galvanized steel sheet or a common steel sheet.

17. The heating system according to claim 1, wherein the top plate of the double-bottom layer is composed of a plate-like material alone, without incorporation of any reinforcing material.

18. The heating system according to any one of claims 2 to 13 and 17, wherein the plate-like material is a particle board (PB), a plywood, a medium density fiberboard (MDF), a high density fiberboard (HDF), an oriented strand board (OSB), a wood wool cement board (WWCB) or a concrete cement board.

19. The heating system according to claim 18, wherein the plate-like material is coated with a waterproof composition composed of 22 to 60% by weight of an acrylic resin, 5 to 30% by weight of a water repellent, 3 to 20% by weight of a hydrogenated rosin, 0.5 to 5% by weight of a penetrant, 2 to 8% by weight of an additive and 1 to 15% by weight of a high-boiling point solvent.