WO2013024181A1 - Natural drywall for continuous ceilings and partitions, having unequal rebates and/or a beveled edge for screwing to framing - Google Patents
Natural drywall for continuous ceilings and partitions, having unequal rebates and/or a beveled edge for screwing to framing Download PDFInfo
- Publication number
- WO2013024181A1 WO2013024181A1 PCT/ES2012/000054 ES2012000054W WO2013024181A1 WO 2013024181 A1 WO2013024181 A1 WO 2013024181A1 ES 2012000054 W ES2012000054 W ES 2012000054W WO 2013024181 A1 WO2013024181 A1 WO 2013024181A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- natural
- partitions
- continuous
- ceilings
- galces
- Prior art date
Links
- 238000005192 partition Methods 0.000 title claims abstract description 14
- 238000009432 framing Methods 0.000 title 1
- 239000011505 plaster Substances 0.000 claims abstract description 15
- 239000000853 adhesive Substances 0.000 claims abstract description 13
- 230000001070 adhesive effect Effects 0.000 claims abstract description 13
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000008397 galvanized steel Substances 0.000 claims description 4
- 229910052602 gypsum Inorganic materials 0.000 claims description 3
- 239000010440 gypsum Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 3
- 230000001934 delay Effects 0.000 claims 1
- 238000009431 timber framing Methods 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 3
- 235000013311 vegetables Nutrition 0.000 description 3
- 239000011152 fibreglass Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
- E04C2/043—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of plaster
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
- E04B9/04—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like
- E04B9/0435—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like having connection means at the edges
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2002/001—Mechanical features of panels
- E04C2002/004—Panels with profiled edges, e.g. stepped, serrated
Definitions
- Gypsum board for continuous ceilings and partitions with uneven gateways and / or beveled edge to screw profiles.
- the sector where the productive activity is developed is plaster, lime and plaster.
- the first type of plates are without galces, which can be made of plasterboard or gypsum plates reinforced with cellulose. These types of plates are manufactured without gauges and in some cases they have a sharp edge so they can be joined with paper tape and joint paste.
- the assembly is carried out song by song without joint between them and on galvanized steel profiles.
- the system of union is by means of paper tape giving rise to not being able to finish the assembly in only one time.
- the phases to be carried out are: application of the filling paste to lay the tape; tape placement and ironing; tape capping; let dry; first termination layer; drying time; second finishing layer; drying time; and finally sanding if necessary. Approximately to have it finished would be two to three days.
- the most common thicknesses are 13 mm, 15 mm and 19 mm; the dimensions are 1200 mm wide and variable length from 2000 mm to 3000 mm.
- the second group of plates are made of plaster with fiberglass and tongue and groove galces.
- This type of plates are characterized by having male-female galces, where one of the galces enters into the other. These plates are also mounted to form continuous ceilings and partitions.
- the assembly is on metal or wooden profiles.
- the adhesive must necessarily be placed plate by plate, as there is no space between the plates once mounted.
- the minimum existing thickness is 20 mm since it cannot be smaller due to the male-female design of the galces.
- the existing dimensions in the market are: thicknesses of 20 mm, 25mm and 30 mm; the dimensions are 600 mm wide and 1000 mm long.
- the third type of plates would be plaster with fiberglass for continuous ceilings that are mounted without profiles.
- This type of plates have two or four equal galces and are joined together by the back by a mixture of vegetable fibers plus plaster, or hanging from the floor by metal braces or braces of vegetable fiber plus plaster. These types of plates are used only for ceilings. The two or four equal galces result in the gap between the plates preventing the adhesive from entering between the plates. In the union of this type of plates no adhesive is used, they are joined by the back with vegetable fiber with plaster. If the use of adhesive is chosen,
- REPLACEMENT SHEET (Rule 26) they would have to mount plate to plate while applying the adhesive at the back of the plate (there is no gap between the rails once mounted) and not at the end of the assembly.
- the existing dimensions in the market are: thicknesses of 16 mm or 20 mm; the dimensions are 600 x 1000 mm or 600 x 600 mm. Disclosure of the invention
- the present invention relates to an orthogonal plate with uneven gauges (their arrangement can be seen in the drawings section) that allow a separation between the plates to introduce the adhesive plus plaster.
- the measurements of the plates will be 1000 x 600 mm, 1200 x 600 mm and 600 x 600 mm, with tolerances according to the UNE 14246 standard.
- the thicknesses of the plates will be from 13 mm to 20 mm.
- the plate will have a bevel on the face to facilitate the introduction of the adhesive material plus plaster that will be arranged in the joints provided between the plates once mounted and forming the continuous ceiling or partition.
- the plate by its design when joining to form or constitute a continuous roof or partition will give rise to an open joint that will allow the introduction of the adhesive with plaster after its assembly and the existence of the galces facilitates assembly, especially for brackets and props
- the plate will allow to be mounted to form continuous ceilings or partitions, bolting to the galvanized steel or wood profiles.
- Figure 1 is a view of a two-gallon plate and the bevel. In the details the constructive form of both galces is appreciated.
- Figure 2 is a view of a plate of four gallons, being uneven two to two, and the bevel. In the details the constructive form of the plate and a section of the same are observed.
- Figure 3 is a view of a plate of two discontinuous galces and the bevel.
- Figure 4 is a view of a plate of four discontinuous galces and the bevel. In the details the constructive form of the plate and a section of the same are observed.
- Figure 5 is a view of the four galces that make up the plate of four uneven galces, both continuous and discontinuous.
- Figure 6 is a view of the four equal gals that make up the plate of four uneven gals, both continuous and discontinuous.
- Figure 7 are the construction details of the various bevels that the plate can carry. Structure and function
- the plate which you want to patent, allows the introduction of the adhesive with plaster once the continuous ceiling or the partition wall is mounted. It also allows to apply the adhesive with plaster at the end of the assembly phase, thanks to the gap between the plates thanks to the galces and facilitating the introduction of the adhesive itself with plaster with the bevel. The entire assembly can be carried out without delay due to the drying time of the materials used.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Panels For Use In Building Construction (AREA)
Abstract
The invention relates to natural drywall for continuous ceilings and partitions, having a type of rebate and bevel that makes it possible to have an open joint for applying adhesive with plaster to said joint, and to obtain a uniform surface for both ceilings and partitions. The system for mounting the natural drywall, both on ceilings and partitions, involves mounting the drywall on galvanized or wood framing.
Description
Descripción Description
Placa de yeso para techos continuos y tabiques con gatees desiguales y/o canto biselado para atornillar a perfileria. Sector de la técnica Gypsum board for continuous ceilings and partitions with uneven gateways and / or beveled edge to screw profiles. Technical sector
El sector donde se desarrolla la actividad productiva es yesos, cales y escayolas. The sector where the productive activity is developed is plaster, lime and plaster.
Técnica anterior Prior art
El primer tipo de placas son sin galces, las cuales pueden ser de cartón yeso o placas de yeso reforzada con celulosa. Estos tipos de placas se fabrican sin galces y en algunos casos tienen el borde afinado para poderlas unir con cinta de papel y pasta de juntas. El montaje se realiza canto a canto sin junta entre ellas y sobre perfileria de acero galvanizado. El sistema de unión es mediante cinta de papel dando lugar a no poderse terminar el montaje en una sola vez. Las fases a realizar son: aplicación de la pasta de relleno para sentar la cinta; colocación y planchado de la cinta; tapado de la cinta; dejar secar; primera capa de terminación; tiempo de secado; segunda capa de terminación; tiempo de secado; y por ultimo lijado si fuese necesario. Aproximadamente para tenerlo terminado serian de dos a tres días. Los espesores más comunes son de 13 mm, 15 mm y 19 mm; las dimensiones son de 1200 mm de ancho y largo variable de 2000 mm a 3000 mm. The first type of plates are without galces, which can be made of plasterboard or gypsum plates reinforced with cellulose. These types of plates are manufactured without gauges and in some cases they have a sharp edge so they can be joined with paper tape and joint paste. The assembly is carried out song by song without joint between them and on galvanized steel profiles. The system of union is by means of paper tape giving rise to not being able to finish the assembly in only one time. The phases to be carried out are: application of the filling paste to lay the tape; tape placement and ironing; tape capping; let dry; first termination layer; drying time; second finishing layer; drying time; and finally sanding if necessary. Approximately to have it finished would be two to three days. The most common thicknesses are 13 mm, 15 mm and 19 mm; the dimensions are 1200 mm wide and variable length from 2000 mm to 3000 mm.
El segundo grupo de placas son de yeso con fibra de vidrio y los galces machihembrados. Este tipo de placas se caracterizan por tener los galces macho-hembra, donde uno de los galces entra dentro del otro. Estas placas se montan igualmente para formar techos continuos y tabiques. El montaje es sobre perfileria metálica o de madera. El adhesivo necesariamente se debe de colocar placa a placa, al no quedar espacio entre las placas una vez montadas. El espesor mínimo existente es de 20 mm ya que no puede ser menor debido al diseño macho-hembra de los galces. Las dimensiones existentes en el mercado son: espesores de 20 mm, 25mm y 30 mm; las dimensiones son 600 mm de ancho y 1000 mm largo. The second group of plates are made of plaster with fiberglass and tongue and groove galces. This type of plates are characterized by having male-female galces, where one of the galces enters into the other. These plates are also mounted to form continuous ceilings and partitions. The assembly is on metal or wooden profiles. The adhesive must necessarily be placed plate by plate, as there is no space between the plates once mounted. The minimum existing thickness is 20 mm since it cannot be smaller due to the male-female design of the galces. The existing dimensions in the market are: thicknesses of 20 mm, 25mm and 30 mm; the dimensions are 600 mm wide and 1000 mm long.
El tercer tipo de placas serian de yeso con fibra de vidrio para techos continuos que se montan sin perfileria. Este tipo de placas disponen de dos o cuatro galces iguales y se unen entre ellas por la parte posterior mediante una mezcla de fibras vegetales más yeso, o colgándose del forjado mediante tirantes metálicos o tirantes de fibra vegetal más yeso. Este tipo de placas se utilizan solo para techos. Los dos o cuatro galces iguales dan lugar a que no quede hueco entre las placas impidiendo que el adhesivo pueda entrar entre las placas. En la unión de este tipo de placas no se utiliza adhesivo, se unen por la parte posterior con fibra vegetal con yeso. Si se optase por la utilización de adhesivo se The third type of plates would be plaster with fiberglass for continuous ceilings that are mounted without profiles. This type of plates have two or four equal galces and are joined together by the back by a mixture of vegetable fibers plus plaster, or hanging from the floor by metal braces or braces of vegetable fiber plus plaster. These types of plates are used only for ceilings. The two or four equal galces result in the gap between the plates preventing the adhesive from entering between the plates. In the union of this type of plates no adhesive is used, they are joined by the back with vegetable fiber with plaster. If the use of adhesive is chosen,
HOJA DE REEMPLAZO (Regla 26)
tendrían que montar placa a placa aplicándose al mismo tiempo el adhesivo por la parte posterior de la placa (no queda hueco entre los galces una vez montados) y no al final del montaje. Las dimensiones existentes en el mercado son: espesores de 16 mm o 20 mm; las dimensiones son 600 x 1000 mm ó 600 x 600 mm. Divulgación de la invención REPLACEMENT SHEET (Rule 26) they would have to mount plate to plate while applying the adhesive at the back of the plate (there is no gap between the rails once mounted) and not at the end of the assembly. The existing dimensions in the market are: thicknesses of 16 mm or 20 mm; the dimensions are 600 x 1000 mm or 600 x 600 mm. Disclosure of the invention
La presente invención se refiera a una placa ortogonal con galces desiguales (la disposición de los mismos se puede observar en el apartado de dibujos) que permiten una separación entre las placas para introducir el adhesivo más yeso. Las medidas de las placas serán de 1000 x 600 mm, 1200 x 600 mm y de 600 x 600 mm, con tolerancias según la norma UNE 14246. Los espesores de las placas serán de 13 mm hasta 20 mm. La placa dispondrá de un bisel por la cara vista para facilitar la introducción del material adhesivo más yeso que se dispondrá en las juntas previstas entre las placas una vez montadas y formando el techo continúo o tabique. The present invention relates to an orthogonal plate with uneven gauges (their arrangement can be seen in the drawings section) that allow a separation between the plates to introduce the adhesive plus plaster. The measurements of the plates will be 1000 x 600 mm, 1200 x 600 mm and 600 x 600 mm, with tolerances according to the UNE 14246 standard. The thicknesses of the plates will be from 13 mm to 20 mm. The plate will have a bevel on the face to facilitate the introduction of the adhesive material plus plaster that will be arranged in the joints provided between the plates once mounted and forming the continuous ceiling or partition.
La placa por su diseño al unirse para formar o constituir un techo continuo o tabique dará lugar a una junta abierta que permitirá la introducción del adhesivo con yeso a posteriori de su montaje y la existencia de los galces facilita el montaje, sobre todo para escuadras y apoyos. La placa permitirá ser montada para formar techos continuos o tabiques, atornillándose a la perfileria de acero galvanizado o madera. The plate by its design when joining to form or constitute a continuous roof or partition will give rise to an open joint that will allow the introduction of the adhesive with plaster after its assembly and the existence of the galces facilitates assembly, especially for brackets and props The plate will allow to be mounted to form continuous ceilings or partitions, bolting to the galvanized steel or wood profiles.
Breve descripción de los dibujos La figura 1 es una vista de una placa de dos galces y el bisel. En los detalles se aprecia la forma constructiva de ambos galces. Brief Description of the Drawings Figure 1 is a view of a two-gallon plate and the bevel. In the details the constructive form of both galces is appreciated.
La figura 2 es una vista de una placa de cuatros galces, siendo desiguales dos a dos, y el bisel. En los detalles se observa la forma constructiva de la placa y una sección de la misma. La figura 3 es una vista de una placa de dos galces discontinuos y el bisel. Figure 2 is a view of a plate of four gallons, being uneven two to two, and the bevel. In the details the constructive form of the plate and a section of the same are observed. Figure 3 is a view of a plate of two discontinuous galces and the bevel.
La figura 4 es una vista de una placa de cuatro galces discontinuos y el bisel. En los detalles se observa la forma constructiva de la placa y una sección de la misma. Figure 4 is a view of a plate of four discontinuous galces and the bevel. In the details the constructive form of the plate and a section of the same are observed.
La figura 5 es una vista de los cuatro galces que conforman la placa de cuatro galces desiguales, tanto continuos como discontinuos. La figura 6 es una vista de los cuatro galces iguales que conforman la placa de cuatro galces desiguales, tanto continuos como discontinuos. Figure 5 is a view of the four galces that make up the plate of four uneven galces, both continuous and discontinuous. Figure 6 is a view of the four equal gals that make up the plate of four uneven gals, both continuous and discontinuous.
La figura 7 son los detalles constructivos de los diversos biseles que puede llevar la placa.
Estructura y función Figure 7 are the construction details of the various bevels that the plate can carry. Structure and function
La placa, que se desea patentar, permite la introducción del adhesivo con yeso una vez montado el techo continuo o el tabique. Además permite aplicar el adhesivo con yeso al terminar la fase de montaje, gracias al hueco entre las placas gracias a los galces y facilitando la introducción del propio adhesivo con yeso con el bisel. La realización de todo el montaje se puede tener sin demoras por el tiempo de secado de los materiales utilizados.
The plate, which you want to patent, allows the introduction of the adhesive with plaster once the continuous ceiling or the partition wall is mounted. It also allows to apply the adhesive with plaster at the end of the assembly phase, thanks to the gap between the plates thanks to the galces and facilitating the introduction of the adhesive itself with plaster with the bevel. The entire assembly can be carried out without delay due to the drying time of the materials used.
Claims
1. Placa de yeso natural para la formación de techos continuos o tabiques caracterizada por las dimensiones de los galces desiguales que dejan una junta abierta entre las placas una vez montadas sobre perfileria de acero galvanizado. 1. Natural plasterboard for the formation of continuous ceilings or partitions characterized by the dimensions of the uneven gates that leave an open joint between the plates once mounted on galvanized steel profiles.
2. Placa según la reivindicación 1 caracterizada por tener los galces desiguales discontinuos. 2. Plate according to claim 1 characterized by having uneven discontinuous gauges.
3. Placa según la reivindicación 1 caracterizada por tener los galces desiguales continuos. 3. Plate according to claim 1 characterized by having continuous uneven gauges.
4. Placa según la reivindicación 1 caracterizada por tener dos o cuatro galces. 4. Plate according to claim 1 characterized by having two or four gallons.
Reivindicación 2 Claim 2
1. Placa de yeso natural para la formación de techos continuos o tabiques caracterizada por las dimensiones de los galces iguales que dejan una junta abierta entre las placas una vez montadas sobre perfileria de acero galvanizado. 1. Natural gypsum board for the formation of continuous ceilings or partitions characterized by the dimensions of the equal galces that leave an open joint between the plates once mounted on galvanized steel profiles.
2. Placa según la reivindicación 2 caracterizada por tener los galces iguales discontinuos con dos o cuatro galces. 2. Plate according to claim 2 characterized by having the same discontinuous gauges with two or four galces.
Reivindicación 3 Claim 3
1. Placa de yeso natural para la formación de techos continuos o tabiques caracterizada por un bisel que facilita la introducción del adhesivo con yeso en la junta abierta que proporcionan los galces 1. Natural plasterboard for the formation of continuous ceilings or partitions characterized by a bevel that facilitates the introduction of the adhesive with plaster in the open joint provided by the galces
Reivindicación 4 Claim 4
1. El sistema de montaje de la placa de yeso natural, tanto en techos continuos como en tabiques, se realizara sin demoras de tiempo de espera en el secado de los materiales empleados en el propio montaje y acabado. 1. The mounting system of the natural plasterboard, both in continuous ceilings and in partitions, will be carried out without waiting time delays in the drying of the materials used in the assembly and finishing.
2. El sistema de montaje de la placa de yeso natural permite el montaje del sistema constructivo de manera completa y un posterior tratamiento de juntas. 2. The mounting system of the natural plasterboard allows the assembly of the construction system completely and subsequent treatment of joints.
HOJA DE REEMPLAZO (Regla 26)
REPLACEMENT SHEET (Rule 26)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES201100980 | 2011-08-18 | ||
ESP201100980 | 2011-08-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013024181A1 true WO2013024181A1 (en) | 2013-02-21 |
Family
ID=47714807
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/ES2012/000054 WO2013024181A1 (en) | 2011-08-18 | 2012-03-06 | Natural drywall for continuous ceilings and partitions, having unequal rebates and/or a beveled edge for screwing to framing |
Country Status (1)
Country | Link |
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WO (1) | WO2013024181A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2524515A1 (en) * | 2013-06-06 | 2014-12-09 | El Alterón S.L. | Natural plasterboard with reinforced fibers of unequal continuous shells on all four edges (Machine-translation by Google Translate, not legally binding) |
CN105201129A (en) * | 2014-09-29 | 2015-12-30 | 中建四局第三建筑工程有限公司 | Precast slab and production method thereof |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB886336A (en) * | 1960-05-27 | 1962-01-03 | Arthur Harvey Dunlap | Improvements in or relating to ceiling constructions and components |
GB998200A (en) * | 1962-02-10 | 1965-07-14 | Poron Insulation Ltd | Three-dimensional ceiling unit |
AU1354576A (en) * | 1975-05-02 | 1977-11-03 | Modulock N Z Ltd | Building panel |
GB2140055A (en) * | 1983-05-16 | 1984-11-21 | Ina Seito Kk | Tile panel |
ES1034216U (en) * | 1996-05-23 | 1996-12-16 | Eleta Jose Ramon Indurain | Perfected false ceiling. (Machine-translation by Google Translate, not legally binding) |
US20040231252A1 (en) * | 2003-05-19 | 2004-11-25 | Benjamin Michael Putti | Building material and method of making and installing the same |
-
2012
- 2012-03-06 WO PCT/ES2012/000054 patent/WO2013024181A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB886336A (en) * | 1960-05-27 | 1962-01-03 | Arthur Harvey Dunlap | Improvements in or relating to ceiling constructions and components |
GB998200A (en) * | 1962-02-10 | 1965-07-14 | Poron Insulation Ltd | Three-dimensional ceiling unit |
AU1354576A (en) * | 1975-05-02 | 1977-11-03 | Modulock N Z Ltd | Building panel |
GB2140055A (en) * | 1983-05-16 | 1984-11-21 | Ina Seito Kk | Tile panel |
ES1034216U (en) * | 1996-05-23 | 1996-12-16 | Eleta Jose Ramon Indurain | Perfected false ceiling. (Machine-translation by Google Translate, not legally binding) |
US20040231252A1 (en) * | 2003-05-19 | 2004-11-25 | Benjamin Michael Putti | Building material and method of making and installing the same |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2524515A1 (en) * | 2013-06-06 | 2014-12-09 | El Alterón S.L. | Natural plasterboard with reinforced fibers of unequal continuous shells on all four edges (Machine-translation by Google Translate, not legally binding) |
CN105201129A (en) * | 2014-09-29 | 2015-12-30 | 中建四局第三建筑工程有限公司 | Precast slab and production method thereof |
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