FLOOR WATERPROOFING STRUCTURE OF PREFABRICATED BATHROOM AND METHOD OF EXECUTING

THE SAME

Technical Field

[1] The present invention relates to the floor waterproofing structure of a prefabricated bathroom and the method of executing the same, more specifically to the floor waterproofing structure and the method of executing the same which forms a floor waterproofing structure by using an waterproofing board shaped with a thermoplastic resin plate and accordingly has an excellent watertight property and a good construction adaptability for any shape and size of the prefabricated bathroom. Background Art

[2] In general, it is required to carry out an waterproofing structure in a bottom layer of a bathroom and there are an wet-type waterproofing method and a dry-type waterproofing method in the waterproofing structure.

[3] In the wet-type waterproofing method, a retaining wall and a masonry wall are installed in all sides and then an waterproofing layer is thickly formed on bottom of a slab by a wet waterproofing construction and a bottom tile construction is carried out on the waterproofing layer. Also, an waterproofing layer is formed on a wall and then a wall tile construction is carried out on the waterproofing layer.

[4] Namely, in the wet-type waterproofing method, the waterproofing structure is formed by reiterating the processes that an waterproofing emulsion permeates into a bottom layer and then a cement paste including an waterproofing agent and an waterproofing mortar are applied and laminated on the bottom layer.

[5] However, in case of the wet-type waterproofing method, the construction process is very troublesome, the construction period becomes longer, and the degree of construction difficulty is high and accordingly it is difficult to carry out the construction accurately. Especially, it is impossible to carry out the wet-type waterproofing method in below zero temperature such as winter and it is difficult to maintain a construction quality uniformly. Also as times goes by, crack of the waterproofing layer can cause an water leakage and accordingly it becomes difficult to maintain and repair the waterproofing layer.

[6] And the bathroom which is constructed by the dry-type waterproofing method is referred to as a 'Unit Bath Room(UBR)' which means a bathroom only assembled in the construction field by using materials necessary for floor, wall and ceiling of a bathroom produced in a factory in advance. [7] Fig. 1 is a drawing for illustrating a structure of a conventional prefabricated bathroom, and Fig. 2 and Fig. 3 are drawings for showing a main part of a floor waterproofing structure applied to the prefabricated bathroom illustrated in Fig. 1, where Fig. 2 is a partly exploded perspective view and Fig. 3 is a sectional view.

[8] Referring to Figs, a floor waterproofing structure of a conventional prefabricated bathroom will be described as folio wings.

[9] An waterproofing layer- forming plate (1) is installed on a slab (8) of a bathroom floor, a cement mortar layer (5) is filled under the waterproofing layer-forming plate (1), a wall panel (3a) is placed on a support projection for a wall panel (6) formed on outer peripheries of the waterproofing layer- forming plate (1) and is supported by being fixed on wall surfaces through a fixing bracket (9), and a wall tile (2b) is attached to surfaces of the wall panel (3a).

[10] A bonding layer (4b) is formed on a bottom surface (4) of the waterproofing layer- forming plate (1) by using a bonding material and then a bottom tile (2a) is attached. In the meantime, a ceiling panel (3b) is installed on an upper side of the wall panel (3a).

[11] The waterproofing layer- forming plate (1) is shaped with a FRP(Fiber glass Reinforced Plastic) which is a thermosetting resin in order to wholly cover a bathroom floor to be constructed and a plywood (4a) is formed inside of the bottom surface (4) in order to improve a strength of the waterproofing layer- forming plate (1).

[12] And a support (7) having a predetermined height is formed below the waterproofing layer- forming plate (1) and accordingly the bottom surface (4) of the waterproofing layer- forming plate (1) is apart from the slab (8) with a constant distance and then a cement mortar is filled between the waterproofing layer-forming plate (1) and the slab (8) so as to form the cement mortar layer (5).

[13] In comparison with the wet- type waterproofing structure, the dry-type waterproofing structure has following characteristics that a total construction method is simple and accordingly a workability is improved, a construction quality is maintained, a good waterproofing property is obtained, a maintenance and repair operation becomes easy and a construction period becomes shorter. But the waterproofing layer-forming plate applied to the floor waterproofing structure of a conventional prefabricated bathroom has following problems.

[14] First, the waterproofing layer-forming plate (1) is produced through Sheet Molding

Compound(SMC) press molding method, Hand Lay Up molding method, Resin Transfer Molding(RTM) molding method by using FRP material of a thermosetting resin. Therefore those methods are advantageous in providing a standard product produced in large quantities through one molding, but has a problem that production facilities including the molding needs a higher cost.

[15] Second, when there are various shape and size of a bathroom to be constructed, a molding for producing the waterproofing layer-forming plate has to be newly produced to be suitable for the bathroom having various shape and size. Therefore production for the new molding needs further cost and time and accordingly the whole construction period becomes longer.

[16] In other word, the waterproofing layer- forming plate produced by one molding may be only applied to single shape and size of a bathroom and a bathroom floor, but cannot be applied to a bathroom having various shapes and size. Therefore, it is required to produce a molding having various sizes and production faculties for the molding and accordingly the waterproofing layer-forming plate has disadvantages in economic aspect and adaptability for a construction field.

[17] Third, the conventional waterproofing layer-forming plate of a thermosetting resin needs a separate process of filling cement mortars, and which a filling of the cement mortar isn't firmly carried out, a resonance is taken place in the space between the waterproofing layer-forming plate and the slab.

[18] In the meantime, to solve the resonance, a bathroom is installed by a dry- wet mixed method that the bottom is finished with the wet-type waterproofing by appling a liquid or urethane waterproofing agent and a wall panel is installed on the waterproofing agent. But this method has disadvantages that the construction period becomes longer and a bottom leakage of a disadvantage problem in a wet type waterproofing method will be taken place as times goes by.

[19] In addition, a mortar shrinkage will be taken place in the curing of a cement mortar filled below the waterproofing layer- forming plate, and the waterproofing layer- forming plate isn't safely positioned and is twisted, and cracks may be taken place sometimes. Therefore the waterproofing layer-forming plate gets wrinkled and its strength becomes shorter and then its life span becomes shorter.

[20] Fourth, a conventional waterproofing layer- forming plate is one-set produced through a molding and the slope of its bottom is set with one direction. Therefore, to drain water into a sewage hole opened in respectively different positions in the prefabricated bathroom to be constructed, it is required to construct a trench separately.

[21] Fifth, the conventional waterproofing layer- forming plate has a support projection for a wall panel on its outer part and is united with the support on its lower part in order to place a wall panel. Therefore in a transfer from a factory to a construction field, a loading work becomes disadvantages, there is a possibility for breakage, the loading space is decreased, and accordingly a transfer cost becomes higher. Disclosure of Invention Technical Problem

[22] Therefore, the invention has been made to solve the above problems and the object of the invention is as follows.

[23] First, an waterproofing board which is applied to a floor waterproofing structure of a prefabricated bathroom is easily produced without a conventional molding production and constructed on various different bathroom floor, so that it isn't required to use a specific molding and a construction period can be decreased as soon as possible.

[24] Second, it is another object of the invention to provide the floor waterproofing structure and the construction method in which an waterproofing board is easily produced in the construction field and the construction adaptability is highly improved.

[25] Third, it is yet another object of the invention to provide the floor waterproofing structure and the construction method which has advantages of a leakage prevention, an uniform construction quality and a maintenance convenience which are advantageous of the conventional prefabricated bathroom, and also prevents a resonance which is disadvantage of the conventional prefabricated bathroom.

[26] Fourth, it is yet another object of the invention to provide the floor waterproofing structure and the construction method which doesn't need to install a specific trench to drain water into the drainage hole, and is applied in case that a position of a drainage hole is different.

[27] Fifth, it is yet another object of the invention to provide the floor waterproofing structure and the construction method in which the waterproofing board is produced in the construction field by using a thermoplastic resin plate and accordingly a loading work becomes comfortable and it is possible to load large quantities in the transfer from the factory to the construction field. Technical Solution

[28] To accomplish the above object, the floor waterproofing structure of a prefabricated bathroom according to the preferred embodiment in the invention comprises an waterproofing board made of a thermoplastic resin material which consists of a bottom member corresponding to a bottom layer of a bathroom and an waterproofing wall of a predetermined height formed on outer peripheries of the bottom member, wherein a penetration hole is formed on the bottom member to correspond to a number and position of a drainage pipe.

[29] Further, it is characteristics to comprise a cement mortar layer formed on the bottom member to be inclined to the penetration hole.

[30] Further, it is characteristics that the thermoplastic resin material is selected from a group comprising a polypropylene resin, a polyethylene resin, a polyvinyl chloride resin, a acrylic resin, a polystyrene resin, an ABS resin, an EP and so on.

[31] Further, among the penetration hole formed on the bottom member of the waterproofing board, the penetration hole positioned in a sewage hole opened on a slab is connected with a pipe coupling for connecting a sewage pipe, wherein the pipe coupling consists of an upper body in which a flange is formed on a lower part of a vertical pipe and the vertical pipe is extended with a predetermined length from the flange having a screw thread on outer circumferences thereof; and a lower body in which a flange is formed on an upper end of a vertical pipe having a screw thread on an inner circumference thereof so as to combine with the screw thread of the upper body passing through the penetration hole, and an interior tube is formed on inside of the vertical pipe and a connecting groove is formed between an outer circumference of the interior tube and an inner circumference of the vertical pipe so as for the sewage pipe to be inserted, and wherein further comprising a bottom tile adhered to surface of the cement mortar layer in state that the upper body positioned on the bottom member of the waterproofing board is connected with the lower body positioned below the bottom member of the waterproofing board through the penetration hole with a interposing packing interposed in the outer circumference of the screw thread of the upper body.

[32] Further, the method for constructing the floor waterproofing structure of a prefabricated bathroom according to the preferred embodiment in the invention comprises the steps of: forming a cut section by cutting each corner of a thermoplastic resin plate of a predetermined dimension with the same vertical and horizontal width; fabricating an waterproofing board in which a bottom member with the vertical and horizontal length corresponding to a bottom layer of a bathroom is formed and an waterproofing wall is formed in outer peripheries thereof, by upwardly bending an exterior part along the bending line linking the cross point of the cut section and joining the cut section faced together; forming a penetration hole on the bottom member of the waterproofing board to be corresponded to a number and position of a drainage pipe; and forming the bottom layer of a prefabricated bathroom by fixing the waterproofing board on a slab.

[33] Further, it is preferable to comprise the step of forming a "V" groove along the bending line prior to upwardly bending the exterior part.

[34] Further, it is preferable to comprise the step of applying a heat along the bending line linking the cross point of the cut section prior to upwardly bending the exterior part.

[35] Further, it is characteristics that the method for joining the cut section is carried out by a thermal bonding process.

[36] Further, it is characteristics that the thermoplastic resin plate is selected from a group comprising a polypropylene resin, a polyethylene resin, a polyvinyl chloride resin, a acrylic resin, a polystyrene resin, an ABS resin, an EP and so on.

[37] Further, it is characteristics to further comprise the step of forming a cement mortar layer on the bottom member of the waterproofing board so as to be inclined to the penetration hole. [38] Further, it is characteristics to comprise the step of combining a pipe coupling for connecting a sewage pipe to the penetration hole positioned in a sewage hole opened on a slab among the penetration hole formed in the bottom member of the waterproofing board, wherein the pipe coupling consists of an upper body in which a flange is formed on a lower part of a vertical pipe and the vertical pipe is extended with a predetermined length from the flange having a screw thread on outer circumferences thereof; and a lower body in which a flange is formed in an upper end of a vertical pipe having a screw thread on an inner circumference thereof so as to combine with the screw thread of the upper body passing through the penetration hole, and an interior tube is formed on inside of the vertical pipe and a connecting groove is formed between an outer circumference of the interior tube and an inner circumference of the vertical pipe so as for the sewage pipe to be inserted, and wherein comprising the step of adhering a bottom tile to surface of the cement mortar layer in state that the upper body positioned on the bottom member of the waterproofing board is connected with the lower body positioned below the bottom member of the waterproofing board through the penetration hole with a interposing packing interposed in the outer- circumference of the screw thread of the upper body.

Advantageous Effects

[39] The floor waterproofing structure of a prefabricated bathroom and the method of executing the same according to the invention has following effects.

[40] First, an waterproofing board can easily be prefabricated and constructed to be suitable for any bottom layer of a prefabricated bathroom to be constructed, so that it doesn't need production faculties and moldings of a high price and accordingly a production cost of the waterproofing layer- forming plate may be decreased.

[41] For example, the production cost of the waterproofing board according to the invention is only 1/3 of that of the conventional waterproofing layer-forming plate produced through a molding.

[42] Second, it is not required to produce a specific molding and especially an waterproofing board is easily produced in the construction field and is installed. Therefore a whole construction period is decreased and accordingly a construction cost is reduced.

[43] Namely, the conventional waterproofing forming-layer plate needs a production time in producing a molding for a specific bathroom and accordingly the construction period is around 1 month. But according to the invention, it is not required to produce a specific molding and accordingly the construction period is decreased by about 1 week.

[44] Third, the invention has advantages of a leakage prevention, an uniform construction quality and a maintenance convenience which are advantages of the conventional pre- fabricated bathroom and also prevent a resonance which is disadvantage of the conventional prefabricated bathroom and accordingly obtains a good waterproofing property.

[45] Fourth, when position of a drainage hole opened on a bathroom floor is various, a mortar layer makes an inclination to the drainage hole to drain an water into the drainage hole. Therefore it is not required to install a specific trench to drain an water into the drainage hole, and even when a position of the drainage hole is different, it is possible to relevantly manage for the water drainage in the construction field.

[46] Fifth, an waterproofing board is fabricated from a thermoplastic resin plate in the construction field. Therefore when the waterproofing board is loaded for transfer to the construction field, the loading work becomes comfortable, and a transfer cost is decreased because much of the waterproofing board is moved once and eventually the transfer time is decreased. Brief Description of Drawings

[47] Fig. 1 is a drawing for illustrating a structure of a conventional prefabricated bathroom.

[48] Fig. 2 and Fig. 3 are drawings for showing a main part of a floor waterproofing structure applied to the prefabricated bathroom illustrated in Fig. 1, where Fig. 2 is a partly exploded perspective view and Fig. 3 is a sectional view.

[49] Fig. 4 is a drawing for illustrating a production process of an waterproofing board installed in the prefabricated bathroom according to the preferable embodiment of the present invention.

[50] Fig. 5 and Fig. 6 are drawings for showing a main part of a floor waterproofing structure applied to a prefabricated bathroom according to a preferable embodiment of the present invention, where Fig. 5 is a partly exploded perspective view and Fig. 6 is a sectional view.

[51] Fig. 7 is a divided perspective view of a pipe coupling for connecting a sewage pipe to a penetration hole formed on the waterproofing board according to the invention.

[52] Fig. 8 is a sectional view for showing an installation state of a pipe coupling.

[53] <Description of the denotation of the main part of drawings>

[54] 1 : waterproofing layer-forming plate 2a : bottom tile

[55] 2b : wall tile 3a : wall panel

[56] 3b : ceiling panel 3c : door frame

[57] 4 : bottom surface 4a : plywood

[58] 4b : bonding layer 5 : cement mortar layer

[59] 6 : support projection for a wall panel 7 : support

[60] 8 : slab 9 : fixing bracket [61] 10 : waterproofing board 11 : thermoplastic resin plate

[62] 12a : cutting line 12b : bending line

[63] 13a, 13b : penetration hole 14 : bottom member

[64] 15a : exterior part 15b : waterproofing wall

[65] 16a : cut section 16b : joining part

[66] 17 : cement mortar layer 18a : bottom tile

[67] 18b : wall tile 19 : wall panel

[68] 20 : slab 30 : pipe coupling

[69] 30A : upper body 30B : lower body

[70] 31a, 31b : vertical pipe 32a, 32b : flange

[71] 33a, 33b : screw thread 34 : interposing packing

[72] 35 : interior tube 36 : bonding groove

Best Mode for Carrying out the Invention

[73] The best embodiment is illustrated with reference to the following drawings. Fig. 4 is a drawing for illustrating a production process of an waterproofing board installed in the prefabricated bathroom according to the preferable embodiment of the present invention. First, as shown in part 'A' of Fig. 4, a thermoplastic resin plate (11) which is shaped as a square board of a specific standard is prepared.

[74] And each corner section of the thermoplastic resin plate (11) is cut along a cutting line (12a) with the same vertical and horizontal width (L3).

[75] Next, as shown in the part 'B' of Fig. 4, the process that a exterior part (15a) is perpendicularly upward-bended along the bending line (12b) linking the cross point of a cut section (16a) is carried out.

[76] In the meantime, in order to install a drainage trap and a sewage hole, at least one more of a penetration hole (13a, 13b) is formed in a determined position of the thermoplastic resin plate (11), namely in the position of the bottom member (14) which is a part placed on the designed bottom layer of the prefabricated bathroom corresponding to a sewage hole of a bathtub and a toilet bowl and a drainage hole of a floor.

[77] Next, as shown in the part 'C of Fig. 4, a joining part (16b) is formed by joining the cut section (16a) which is contacted by upward bending, and then an waterproofing board (10) of which an waterproofing wall (15b) is formed on its outer peripheries is completely produced. Mode for the Invention

[78] Hereinafter, a preferable embodiment of the present invention is illustrated with reference to the following drawings. The invention is not restricted by the disclosed embodiment and the present invention can be embodied with different various forms. So the embodiment is provided only in order to perfectly disclose the present invention and completely inform a person skilled in the art of the category of the invention.

[79] Fig. 4 is a drawing for illustrating a production process of an waterproofing board installed in the prefabricated bathroom according to the preferable embodiment of the present invention.

[80] First, as shown in part 'A' of Fig. 4, a thermoplastic resin plate (11) which is shaped as a square board of a specific standard is prepared.

[81] The thermoplastic resin plate (11) may be produced through series of processes in production faculties or may be used by purchasing a thermoplastic resin plate (11) of ready-made articles of a predetermined size without specific production faculties.

[82] Therefore the thermoplastic resin plate (11) is produced and used as the standard which is suitable for shape and size of a specific bathroom floor or the thermoplastic resin plate of ready-made articles of a predetermined size is used by cutting and processing according to a standard of shape and size of a bathroom floor. Here, it is preferable that the standard is respectively about 200 mm longer than a horizontal length (Ll) or a vertical length (L2) of the designed bathroom floor.

[83] And each corner section of the thermoplastic resin plate (11) is cut along a cutting line (12a) with the same vertical and horizontal width (L3) and then the width (L3) is about 100mm.

[84] Here, the thermoplastic resin material forming the thermoplastic resin plate (11) is selected from a group comprising a polypropylene resin (PP), a polyethylene resin (PE), a polyvinyl chloride resin (PVC), an acrylic resin, a polystyrene resin (PS), an acrylonitrile butadiene styrene co-polymer (ABS resin), an Enginering Plastics (EP) and so on, and accordingly a bending process in the next processes can be easily carried out.

[85] Next, as shown in the part 'B' of Fig. 4, the process that a exterior part (15a) is perpendicularly upward-bended along the bending line (12b) linking the cross point of a cut section (16a) is carried out.

[86] The bending process is carried out by applying a heat along the bending line (12b) or by forming a "V" groove along the bending line (12b) with a specific depth.

[87] In the meantime, in order to install a drainage trap and a sewage hole, at least one more of a penetration hole (13a, 13b) is formed in a determined position of the thermoplastic resin plate (11), namely in the position of the bottom member (14) which is a part placed on the designed bottom layer of the prefabricated bathroom corresponding to a sewage hole of a bathtub and a toilet bowl and a drainage hole of a floor.

[88] Next, as shown in the part 'C of Fig. 4, a joining part (16b) is formed by joining the cut section (16a) which is contacted by upwardly bending and then an waterproofing board (10) of which an waterproofing wall (15b) is formed on its outer peripheries thereof is completely produced. Here, it is preferable to use a thermal bonding process as the joining method.

[89] The series of processes for cutting the thermoplastic resin plate (11) of a specific standard according to the standard suitable for shape and size of a bathroom floor and for bending and joining the exterior part (15a) of the thermoplastic resin plate (11) are carried out by automated production faculties or may be carried out in a construction field where a worker may cut with an electronic saw and a cut knife and bend with a bending machine.

[90] Here, the waterproofing wall (15b) not only prevents an water leakage but also supports the wall panel (19) as shown in Figs. 5 and 6. and the height of the waterproofing wall (15b) is generally about 100mm and may be higher or lower than that length.

[91] Like this, the waterproofing board (10) is installed in the construction field with the prefabricated materials in advance manufactured in the factory by the series of processes as described above and especially is directly produced in the construction field according to shape and size of the bathroom to be constructed and then is installed.

[92] Therefore because the thermoplastic resin plate (11) is produced in the construction field, in the loading of the thermoplastic resin plate (11) for transferring to a construction field, the thermoplastic resin plate (11) of a plate shape is easily loaded and much of the thermoplastic resin plate (11) is loaded once and accordingly a transfer cost is decreased and a transfer time is reduced.

[93] Fig. 5 and Fig. 6 are drawings for showing a main part of a floor waterproofing structure applied to the prefabricated bathroom according to a preferable embodiment of the present invention, where Fig. 5 is a partly exploded perspective view and Fig. 6 is a sectional view.

[94] Referring to the Figs. 5 and 6, an waterproofing structure and a construction method applied with the waterproofing board (10) produced by the processes will be descried.

[95] When the waterproofing board (10) is produced in the construction field, shape and size of the bottom member (14) is decided to be suitable for a shape and size of the bathroom floor, an exterior part (15a) is formed by cutting each corner of the thermoplastic resin plate (11), and an waterproofing wall (15b) is formed by upwardly bending the exterior part (15a) and joining the exterior part (15a).

[96] Here, in the bottom member (14) of the waterproofing board (10), the penetration

(13a, 13b) is formed to correspond to the position corresponding to a sewage hole and a drainage hole of the bathroom.

[97] The waterproofing board (10) produced by the above processes is installed on a slab

(20).

[98] As shown in Fig 5 and Fig 6, the waterproofing board (10) which is produced in order to be suitable for shape and size of a bathroom to be constructed, namely in order to cover total bottom layer of a bathroom is installed on the slab (20).

[99] Here, the waterproofing board (10)is installed so that the penetration hole (not shown in Figs. 5 and 6) formed on the bottom member (14) is corresponded to the position of a sewage hole and a drainage hole opened on the slab (20).

[100] Next, a wall panel (19) is installed.

[101] In state that the waterproofing board (10) is installed on the slab (20), the wall panel (19) on which a surface materials such as a tile, a marble and so on is attached is prefabricated by being attached to inside of the waterproofing wall (15b) of the waterproofing board (10).

[102] Here, it is preferable that the wall panel (19) is accurately prefabricated to be vertically and horizontally fitted and is adhered to the waterproofing wall (15b) without vacancies. But if when there are vacancies between the waterproofing wall (15b) and the wall panel (19), a urethane foam is inserted to seal up the vacancies.

[103] Then a cement mortar layer is formed and a bottom tile (18a) is installed.

[104] The cement mortar layer (17) is applied and formed on the bottom member (14) of the waterproofing board (10) with a specific thickness, for example about 20 to 80mm and the bottom tile (18a) is adhered on the cement mortar layer (17), and then the construction of the floor waterproofing structure of a prefabricated bathroom is finished.

[105] Here, the bottom tile (18a) is adhered on the cement mortar layer (17) so as to be inclined to the sewage hole so that there is no water on the bottom tile (18a) when the bottom tile (18a) is adhered on the cement mortar layer (17).

[106] Finally, a method for constructing a ceiling panel to an upper part of the wall panel (19) is conventional and explanation of that method is omitted.

[107] In the meantime, when the construction for the waterproofing board (10) is completed, a lower part of the bottom member (14) is adhered on the slab (20) and accordingly a resonance between the waterproofing board (10) and the slab (20) never be taken place.

[108] The invention isn't limited to the embodiment described above and may be embodied by various alteration and modification method in the scope of the technical substances and characteristics of the invention.

[109] For example, a thickness of the cement mortar layer (17) on the waterproofing board (10) isn't limited to 20 to 80mm and may be increased or decreased according to a design of the bathroom floor.

[110] Also, as the thermoplastic resin for the waterproofing board (10), any composite resin having a good waterproofing property, a good bending property and a good cutting property may be used.

[I l l] The floor waterproofing structure of a prefabricated bathroom according to the invention is applied to a bottom waterproofing of a conventional prefabricated bathroom, but isn't necessarily limited to the bottom waterproofing of a conventional prefabricated bathroom and may be naturally applied to the bottom waterproofing of a conventional bathroom.

[112] Fig. 7 is a divided perspective view of a pipe coupling for connecting a sewage pipe to a penetration hole formed on the waterproofing board according to the invention, and Fig. 8 is a sectional view for showing an installation state of a pipe coupling.

[113] In the description of the waterproofing structure and the construction method, when the penetration (13a)(13b) on the bottom member (15) of the waterproofing board (10) is positioned to be suitable for the sewage hole and the drainage hole opened on the slab (20), a pipe coupling (30) is connected to the penetration hole (13a)(13b) so that a piping process for connecting a sewage pipe is carried out.

[114] In general, as the sewage pipe, VGl (generally, PVC pipe), VG2(PVC pipe for sewage), 2040(namely, 'soundproof pipe'), PVC double pipe(pipe of a double wall structure which forms an air-layer, namely 'low sound pipe') and so on are used and generally have a same outer diameter of about 114mm but a different inner diameter respectively.

[115] The pipe coupling (30) is invented by the applicant of the invention to be applied to the waterproofing board (10) of the invention, so that the pipe coupling (30) is applied to any sewage pipe such as VGl, VG2, 2040, PVC double wall pipe having the same outer diameter and different thickness.

[116] The pipe coupling (30) consists of an upper body (30A) and a lower body (30B) which are separated to be easily installed.

[117] In the upper body (30A), a flange (32a) is formed on a lower part of a vertical pipe (31a) and the vertical pipe (31a) extends toward a lower part of the flange (32a) and has a screw thread (33a) on an outer-circumference thereof.

[118] In the lower body (30B), a flange (32b) is formed in an upper end of a vertical pipe (31b) having a screw thread (33b) in inner-circumference thereof. An interior tube (35) is formed on inside of the vertical pipe (31b) and a connecting groove (36) is formed between an outer-circumference of the interior tube (35) and an inner circumference of the vertical pipe (31b) so as to be inserted with the sewage pipe.

[119] And a interposing packing (34) is placed on the vertical pipe (31b) of a lower part of the flange (32a) of the upper body (30A) to prevent an water leakage when the upper body (30A) and the lower body (30B) are connected.

[120] referring to the Fig. 8, operations and effects of the pipe coupling (30) are described.

[121] First, to connect the pipe coupling (30) into the penetration hole (13a)(13b), on the state that the upper body (30A) and lower body (30B) is separated, the upper body (30A) is placed on the bottom member (14) of the waterproofing board (10) and the lower body (30B) is placed on a lower part of bottom member (14) of the waterproofing board (10). Here, the interposing packing (34) is interposed on an outer- circumference of the screw thread (33a) of the upper body (30A).

[122] Next, the screw thread (33a) of the upper body (30A) is inserted through the penetration (13a)(13b) and screw-connected with the screw thread (33b) of the lower body (30B), and the screw thread (33a) is twisted. So the interposing packing (34) is pressed by the flange (32a) of the upper body (30A) and attached on the bottom member (14) of the waterproofing board (10), and accordingly the flange (32b) of the lower body (30B) is adhered on a lower part of the bottom member (14) of the waterproofing board (10).

[123] Here, an outer diameter (Dl) of the interior tube (35) of the lower body (30B) is formed to be suitable for a sewage pipe having the smallest inner diameter and an inner diameter (D2) of the connecting groove (36) is formed to be suitable for a sewage pipe of the same outer diameter.

[124] For example, in case of the VGl, 2040, PVC double wall pipe as a sewage pipe having a thicker thickness, the outer-circumference of the sewage pipe is adhered to the inner-circumference of the connecting groove (36) and connected. Also, in case of the sewage pipe having an outer diameter and an inner diameter to be suitable for the connecting groove (36), an inner circumference of the sewage pipe is adhered to an outer circumference of the interior tube (35) and connected. In the meantime, in case of VG2 having the smallest thickness, the outer circumference of the sewage pipe is adhered to the inner circumference of the connecting groove (36) and connected.

[125] Therefore, irrespective of types of the sewage pipe, any sewage pipe is easily connected by the pipe coupling (30).

[126] Like this, the floor waterproofing structure and the construction method according to the invention are described referring to the drawings and the invention isn't limited to the examples and drawings disclosed in the invention and is embodied with various modification by the person in the field within the scope of the technical thought.

[127]

[128]

Industrial Applicability

[129] The present invention relates to the floor waterproofing structure of a prefabricated bathroom and the method of executing the same, more specificly to the floor waterproofing structure and the method of executing the same which has an excellent watertight property and a good construction adaptability for any shape and size of the prefabricated bathroom and accordingly a construction cost is decreased and a construction period is reduced in construction and remodeling of the various buildings.