EP1457615A1 - Wall element with Styropor particles - Google Patents

Wall element with Styropor particles Download PDF

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Publication number
EP1457615A1
EP1457615A1 EP04005294A EP04005294A EP1457615A1 EP 1457615 A1 EP1457615 A1 EP 1457615A1 EP 04005294 A EP04005294 A EP 04005294A EP 04005294 A EP04005294 A EP 04005294A EP 1457615 A1 EP1457615 A1 EP 1457615A1
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EP
European Patent Office
Prior art keywords
wall element
element according
layer
balls
cement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04005294A
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German (de)
French (fr)
Inventor
Dieter Dahlke
Mathias Wetzel
Johannes Schwörer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kastell GmbH
Original Assignee
Kastell GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kastell GmbH filed Critical Kastell GmbH
Publication of EP1457615A1 publication Critical patent/EP1457615A1/en
Withdrawn legal-status Critical Current

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    • 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
    • E04C2/049—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 completely or partially of insulating material, e.g. cellular concrete or foamed plaster
    • 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
    • E04C2/26—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups
    • E04C2/284—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating
    • E04C2/288—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating composed of insulating material and concrete, stone or stone-like material

Definitions

  • the invention relates to a wall element as a prefabricated component for buildings.
  • a wall element as a prefabricated component for buildings.
  • the finished part is manufactured in a production plant and then to the location transported, on which the building is built in prefabricated construction. Accordingly, there is a requirement that such wall elements have a simple constructive They should have a structure and be easy to manufacture, even in large ones Quantities can be produced.
  • a base plate is made of Liapor, i.e. made of concrete, the expanded clay contains.
  • This base plate is connected to a mounting plate that e.g. as Liaver intent is known.
  • This building board contains cement glue Recycled glass with air pockets.
  • a composite wall element which is a base plate contains concrete, on which a polystyrene plate is pegged.
  • the disadvantage is here that no moisture diffuses through this wall element can and at the boundary layer between polystyrene plate and concrete slab moisture problems can arise.
  • This task is solved for a wall element as a prefabricated component for buildings, wherein the wall element contains a first layer of lightweight concrete, the surface is directly connected to another layer.
  • This additional layer contains foam balls embedded in a cement matrix.
  • the wall element has due to the embedding of foam balls a favorable thermal insulation value. Furthermore, the total weight of the wall element low, making it particularly favorable for prefabricated buildings of buildings.
  • a particular advantage is the fact that as a result of the used cement matrix moisture compensation over the cement paste can and, unlike the composite system with polystyrene plate, a moisture problem at the boundary layer between the layer of lightweight concrete and the other layer does not occur.
  • foam balls are expanded Polystyrene balls or styrofoam balls are used.
  • Polystyrene and polystyrene are cheap bulk plastics that are easy to manufacture and cheap Have insulation properties. This material gives the additional layer the necessary favorable thermal insulation value. Because of the use of these plastics in the form of small balls, these do not form a diffusion barrier, so that a moisture balance can take place over the balls.
  • the foam balls preferably have a diameter of 0.5 to 2.5 mm, preferably 0.5 to 1.5 mm. With such a size, the Mix the foam balls lightly with the cement matrix so that the mixture is easy to process.
  • An exemplary embodiment is characterized in that the further layer 70 contains up to 90 percent by volume of foam balls, preferably 80 to 90 By volume. In this way, the specific weight of this is further Layer significantly reduced, making the entire wall element at favorable constructional values has a low weight.
  • a wall element 10 which is a base plate as the first layer 12 and contains an outer plate 14 as a further layer.
  • the base plate 12 consists of light concrete and contains a mixture of light sand, cement and water and expanded clay.
  • the base plate typically has a thickness L1 of 10 to 30 cm.
  • the outer plate 14 contains foam balls embedded in a cement matrix 16.
  • the thickness of the outer plate 14 is typically in the range of 1 to 30 cm, preferably in the range of 5 to 20 cm.
  • the foam balls 16 consist of expanded polystyrene balls or styrofoam balls and have a diameter of 0.5 to 2.5 mm, preferably 0.5 up to 1.5 mm.
  • the outer plate 14 contains about 70 to 90 percent by volume Foam balls 16 and thus has a low specific weight.
  • the two Layers 14 and 12 are in a production plant for prefabricated components wet-on-wet concreted together and hardened together. You are thus imagining uniform component.
  • the wall element 10 typically has a thermal insulation value or U value of 0.2 to 0.6 W / m 2 K, preferably 0.24 to 0.35 W / m 2 K. It is therefore particularly suitable as an outer wall in a building ,
  • a particular advantage of the wall element 10 is that it is breathable and moisture is allowed to pass through the cement matrix.
  • the example shown in FIG. 1 can also be expanded.
  • the layer 12 on a board preferably a wooden board, a particle board or a cement chipboard and be connected to it.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
  • Panels For Use In Building Construction (AREA)
  • Porous Artificial Stone Or Porous Ceramic Products (AREA)

Abstract

A wall element as a finished building component for buildings with a first layer of light concrete, the upper surface of which is bonded directly to another layer, where the first layer contains foam spheres embedded in a cement matrix.

Description

Die Erfindung betrifft ein Wandelement als Fertigbauteil für Gebäude. Ein solches Fertigbauteil wird in einem Produktionsbetrieb hergestellt und dann zu dem Ort transportiert, an welchem das Gebäude in Fertigbauweise errichtet wird. Demgemäß besteht das Erfordernis, dass solche Wandelemente einen einfachen konstruktiven Aufbau haben sollen und fertigungstechnisch leicht und auch in großen Stückzahlen herstellbar sind.The invention relates to a wall element as a prefabricated component for buildings. Such one The finished part is manufactured in a production plant and then to the location transported, on which the building is built in prefabricated construction. Accordingly, there is a requirement that such wall elements have a simple constructive They should have a structure and be easy to manufacture, even in large ones Quantities can be produced.

Aus der Baupraxis ist es bekannt, ein Wandelement aus zwei Platten zusammenzusetzen, wobei eine Grundplatte aus Liapor besteht, d.h. aus Beton, der Blähton enthält. Diese Grundplatte ist mit einer Aufbauplatte verbunden, die z.B. als Liaver-Vorsatz bekannt ist. Diese Aufbauplatte enthält in Zementleim eingebundenes Recyclingglas mit Lufteinschlüssen.From construction practice it is known to assemble a wall element from two panels, where a base plate is made of Liapor, i.e. made of concrete, the expanded clay contains. This base plate is connected to a mounting plate that e.g. as Liaver intent is known. This building board contains cement glue Recycled glass with air pockets.

Es ist weiterhin ein zusammengesetztes Wandelement bekannt, das eine Grundplatte aus Beton enthält, auf der eine Styroporplatte aufgedübelt ist. Nachteilig ist hierbei, dass durch dieses Wandelement keine Feuchtigkeit hindurchdiffundieren kann und an der Grenzschicht zwischen Styroporplatte und Betonplatte Feuchtigkeitsprobleme entstehen könnnen.A composite wall element is also known, which is a base plate contains concrete, on which a polystyrene plate is pegged. The disadvantage is here that no moisture diffuses through this wall element can and at the boundary layer between polystyrene plate and concrete slab moisture problems can arise.

Es ist Aufgabe der Erfindung, ein Wandelement anzugeben, das einfach aufgebaut ist, gute bautechnische Kennwerte hat und einfach herzustellen ist.It is an object of the invention to provide a wall element that is simple in structure is, has good structural characteristics and is easy to manufacture.

Diese Aufgabe wird für ein Wandelement als Fertigbauteil für Gebäude gelöst, wobei das Wandelement eine erste Schicht aus Leichtbeton enthält, deren Oberfläche unmittelbar mit einer weiteren Schicht verbunden ist. Diese weitere Schicht enthält in einer Zement-Matrix eingebettete Schaumstoffkugeln.This task is solved for a wall element as a prefabricated component for buildings, wherein the wall element contains a first layer of lightweight concrete, the surface is directly connected to another layer. This additional layer contains foam balls embedded in a cement matrix.

Gemäß der Erfindung hat das Wandelement infolge der Einbettung von Schaumstoffkugeln einen günstigen Wärmedämmwert. Weiterhin ist das gesamte Gewicht des Wandelements niedrig, so dass es sich besonders günstig für den Fertigbau von Gebäuden eignet. Ein besonderer Vorteil ist darin zu sehen, dass infolge der verwendeten Zement-Matrix ein Feuchtigkeitsausgleich über den Zementleim erfolgen kann und anders als bei dem Verbundsystem mit Styroporplatte ein Feuchtigkeitsproblem an der Grenzschicht zwischen der Schicht aus Leichtbeton und der weiteren Schicht nicht auftritt.According to the invention, the wall element has due to the embedding of foam balls a favorable thermal insulation value. Furthermore, the total weight of the wall element low, making it particularly favorable for prefabricated buildings of buildings. A particular advantage is the fact that as a result of the used cement matrix moisture compensation over the cement paste can and, unlike the composite system with polystyrene plate, a moisture problem at the boundary layer between the layer of lightweight concrete and the other layer does not occur.

Bei einem bevorzugten Ausführungsbeispiel werden als Schaumstoffkugeln expandierte Polystyrolkugeln oder Styroporkugeln verwendet. Polystyrol und Styropor sind billige Massenkunststoffe, die einfach herzustellen sind und günstige Dämmeigenschaften haben. Dieses Material gibt der weiteren Schicht den erforderlichen günstigen Wärmedämmwert. Aufgrund der Verwendung dieser Kunststoffe in Form von kleinen Kugeln bilden diese keine Diffusionssperre, so dass an den Kugeln vorbei ein Feuchtigkeitsausgleich stattfinden kann.In a preferred embodiment, foam balls are expanded Polystyrene balls or styrofoam balls are used. Polystyrene and polystyrene are cheap bulk plastics that are easy to manufacture and cheap Have insulation properties. This material gives the additional layer the necessary favorable thermal insulation value. Because of the use of these plastics in the form of small balls, these do not form a diffusion barrier, so that a moisture balance can take place over the balls.

Vorzugsweise haben die Schaumstoffkugeln einen Durchmesser von 0,5 bis 2,5 mm, vorzugsweise 0,5 bis 1,5 mm. Bei einer solchen Größe lassen sich die Schaumstoffkugeln leicht mit der Zement-Matrix vermischen, so dass das Gemisch leicht verarbeitbar ist.The foam balls preferably have a diameter of 0.5 to 2.5 mm, preferably 0.5 to 1.5 mm. With such a size, the Mix the foam balls lightly with the cement matrix so that the mixture is easy to process.

Ein Ausführungsbeispiel ist dadurch gekennzeichnet, dass die weitere Schicht 70 bis 90 Volumenprozent an Schaumstoffkugeln enthält, vorzugsweise 80 bis 90 Volumenprozent. Auf diese Weise ist das spezifische Gewicht dieser weiteren Schicht erheblich verringert, wodurch das gesamte Wandelement bei günstigen bautechnischen Werten ein geringes Gewicht hat.An exemplary embodiment is characterized in that the further layer 70 contains up to 90 percent by volume of foam balls, preferably 80 to 90 By volume. In this way, the specific weight of this is further Layer significantly reduced, making the entire wall element at favorable constructional values has a low weight.

Ein Ausführungsbeispiel der Erfindung wird im folgenden anhand der Figur 1 erläutert.An embodiment of the invention is explained below with reference to Figure 1.

In Figur 1 ist ein Wandelement 10 dargestellt, das als erste Schicht eine Grundplatte 12 und als weitere Schicht eine Außenplatte 14 enthält. Die Grundplatte 12 besteht aus Leichtbeton und enthält ein Gemisch aus Leichtsand, Zement, Wasser und Blähton. Die Grundplatte hat typischerweise eine dicke L1 von 10 bis 30 cm.In Figure 1, a wall element 10 is shown, which is a base plate as the first layer 12 and contains an outer plate 14 as a further layer. The base plate 12 consists of light concrete and contains a mixture of light sand, cement and water and expanded clay. The base plate typically has a thickness L1 of 10 to 30 cm.

Die Außenplatte 14 enthält in einer Zement-Matrix eingebettete Schaumstoffkugeln 16. Die Dicke der Außenplatte 14 liegt typischerweise im Bereich von 1 bis 30 cm, vorzugsweise im Bereich von 5 bis 20 cm. The outer plate 14 contains foam balls embedded in a cement matrix 16. The thickness of the outer plate 14 is typically in the range of 1 to 30 cm, preferably in the range of 5 to 20 cm.

Die Schaumstoffkugeln 16 bestehen aus expandierten Polystyrolkugeln oder Styroporkugeln und haben einen Durchmesser von 0,5 bis 2,5 mm, vorzugsweise 0,5 bis 1,5 mm. Die Außenplatte 14 enthält etwa 70 bis 90 Volumenprozent an Schaumstoffkugeln 16 und hat damit ein geringes spezifisches Gewicht. Die beiden Schichten 14 und 12 werden in einem Produktionsbetrieb für Fertigbauteile naß-in-naß zusammen betoniert und zusammen ausgehärtet. Sie bilden somit ein einheitliches Bauteil.The foam balls 16 consist of expanded polystyrene balls or styrofoam balls and have a diameter of 0.5 to 2.5 mm, preferably 0.5 up to 1.5 mm. The outer plate 14 contains about 70 to 90 percent by volume Foam balls 16 and thus has a low specific weight. The two Layers 14 and 12 are in a production plant for prefabricated components wet-on-wet concreted together and hardened together. You are thus imagining uniform component.

Typischerweise hat das Wandelement 10 einen Wärmedämmwert bzw. U-Wert von 0,2 bis 0,6 W/m2K, vorzugsweise 0,24 bis 0,35 W/m2K. Es eignet sich daher insbesondere als Außenwand in einem Gebäude.The wall element 10 typically has a thermal insulation value or U value of 0.2 to 0.6 W / m 2 K, preferably 0.24 to 0.35 W / m 2 K. It is therefore particularly suitable as an outer wall in a building ,

Ein besonderer Vorteil des Wandelements 10 liegt darin, dass es atmungsaktiv ist und Feuchtigkeit durch die Zement-Matrix hindurchgelassen wird.A particular advantage of the wall element 10 is that it is breathable and moisture is allowed to pass through the cement matrix.

Das in Figur 1 gezeigte Beispiel kann auch erweitert werden. Beispielsweise kann die Schicht 12 auf einer Platte, vorzugsweise einer Holzplatte, einer Spanplatte oder einer Zement-Spanplatte angeordnet sein und mit dieser verbunden werden.The example shown in FIG. 1 can also be expanded. For example the layer 12 on a board, preferably a wooden board, a particle board or a cement chipboard and be connected to it.

Claims (11)

Wandelement als Fertigbauteil für Gebäude,
mit einer ersten Schicht aus Leichtbeton,
deren Oberfläche unmittelbar mit einer weiteren Schicht verbunden ist,
wobei die weitere Schicht in einer Zement-Matrix eingebettete Schaumstoffkugeln enthält.Wall element as prefabricated component for buildings,
with a first layer of lightweight concrete,
the surface of which is directly connected to another layer,
the further layer containing foam balls embedded in a cement matrix. Wandelement nach Anspruch 1, dadurch gekennzeichnet, dass als Schaumstoffkugeln expandierte Polystyrolkugeln oder Styroporkugeln vorgesehen sind.Wall element according to claim 1, characterized in that expanded polystyrene balls or styrofoam balls are provided as foam balls. Wandelement nach Anspruch 2, dadurch gekennzeichnet, dass die Schaumstoffkugeln einen Durchmesser von 0,5 bis 2,5 mm, vorzugsweise 0,5 bis 1,5 mm haben.Wall element according to claim 2, characterized in that the foam balls have a diameter of 0.5 to 2.5 mm, preferably 0.5 to 1.5 mm. Wandelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die weitere Schicht 70 bis 90 Volumenprozent an Schaumstoffkugeln enthält, vorzugsweise 80 bis 90 Volumenprozent.Wall element according to one of the preceding claims, characterized in that the further layer contains 70 to 90 percent by volume of foam balls, preferably 80 to 90 percent by volume. Wandelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die erste Schicht Leichtsand, Zement, Wasser und Blähton enthält.Wall element according to one of the preceding claims, characterized in that the first layer contains light sand, cement, water and expanded clay. Wandelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die erste Schicht eine Dicke von 10 bis 30 cm hat, und vorzugsweise als Grundplatte ausgebildet ist.Wall element according to one of the preceding claims, characterized in that the first layer has a thickness of 10 to 30 cm, and is preferably designed as a base plate. Wandelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die weitere Schicht eine Dicke im Bereich von 1 bis 30 cm hat, vorzugsweise 5 bis 20 cm.Wall element according to one of the preceding claims, characterized in that the further layer has a thickness in the range from 1 to 30 cm, preferably 5 to 20 cm. Wandelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die erste Schicht und die weitere Schicht naß-in-naß zusammen betoniert und zusammen ausgehärtet ist. Wall element according to one of the preceding claims, characterized in that the first layer and the further layer are wet-on-wet concreted together and cured together. Wandelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie einen U-Wert von 0,2 bis 0,6 W/m2K hat, vorzugsweise 0,24 bis 0,35 W/m2K.Wall element according to one of the preceding claims, characterized in that it has a U-value of 0.2 to 0.6 W / m 2 K, preferably 0.24 to 0.35 W / m 2 K. Wandelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es als Außenwand in einem Gebäude eingesetzt ist.Wall element according to one of the preceding claims, characterized in that it is used as an outer wall in a building. Wandelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die erste Schicht auf einer Platte, vorzugsweise einer Holzplatte, einer Spanplatte oder einer Zementspanplatte, angeordnet und mit dieser verbunden ist.Wall element according to one of the preceding claims, characterized in that the first layer is arranged on a plate, preferably a wooden plate, a particle board or a cement chipboard, and is connected to the latter.
EP04005294A 2003-03-10 2004-03-05 Wall element with Styropor particles Withdrawn EP1457615A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20303762U 2003-03-10
DE20303762U DE20303762U1 (en) 2003-03-10 2003-03-10 Wall element with polystyrene balls

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EP1457615A1 true EP1457615A1 (en) 2004-09-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2781495A3 (en) * 2013-03-19 2014-10-29 Nichiha Corporation Building board and method for producing building board

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007016247A1 (en) * 2007-04-04 2008-10-16 B. Lütkenhaus GmbH Prefabricated wall or ceiling element has load-bearing layer bounding on insulating layer and these two layers are permanently connected together and have matching coefficients of thermal expansion
ITBZ20080043A1 (en) * 2008-09-30 2010-04-01 Riccardo Osele PREFABRICATED WALL IN EXPANDED CLAY WITH POLYSTYRENE INSULATION.
ES2554909T3 (en) * 2012-03-23 2015-12-28 Cemex Research Group Ag Structural concrete wall with thermal insulation and manufacturing process

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2023609A1 (en) * 1970-05-14 1971-12-02 Robert Bosch Gmbh, 7000 Stuttgart Prefabricated multilayer building board, in particular facade board and method for their production
DE2444382B1 (en) * 1974-09-17 1976-01-15 Voest Ag Strong heat-insulating lightweight concrete - contg cement granulated blast furnace slag and close-cell polystyrene particles
US4015387A (en) * 1973-08-30 1977-04-05 Tramex S.A. Prefabricated structural elements for partitions and walls of buildings and partitions and walls consisting of such elements
WO1988005765A1 (en) * 1987-01-28 1988-08-11 Markus Stracke Process for producing lightweight concrete
WO1997040239A1 (en) * 1996-04-18 1997-10-30 Alpha Brevet S.A. Wall panel for producing walls
DE19854884A1 (en) * 1998-11-27 2000-06-15 Heilit & Woerner Bau Ag Method for producing an at least two-layer outer wall element and an outer wall element produced thereby

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2023609A1 (en) * 1970-05-14 1971-12-02 Robert Bosch Gmbh, 7000 Stuttgart Prefabricated multilayer building board, in particular facade board and method for their production
US4015387A (en) * 1973-08-30 1977-04-05 Tramex S.A. Prefabricated structural elements for partitions and walls of buildings and partitions and walls consisting of such elements
DE2444382B1 (en) * 1974-09-17 1976-01-15 Voest Ag Strong heat-insulating lightweight concrete - contg cement granulated blast furnace slag and close-cell polystyrene particles
WO1988005765A1 (en) * 1987-01-28 1988-08-11 Markus Stracke Process for producing lightweight concrete
WO1997040239A1 (en) * 1996-04-18 1997-10-30 Alpha Brevet S.A. Wall panel for producing walls
DE19854884A1 (en) * 1998-11-27 2000-06-15 Heilit & Woerner Bau Ag Method for producing an at least two-layer outer wall element and an outer wall element produced thereby

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2781495A3 (en) * 2013-03-19 2014-10-29 Nichiha Corporation Building board and method for producing building board
TWI570309B (en) * 2013-03-19 2017-02-11 日吉華股份有限公司 Building board and method for producing building board

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