WO2014091276A1 - Panneau de paroi acoustique - Google Patents

Panneau de paroi acoustique Download PDF

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Publication number
WO2014091276A1
WO2014091276A1 PCT/IB2012/057188 IB2012057188W WO2014091276A1 WO 2014091276 A1 WO2014091276 A1 WO 2014091276A1 IB 2012057188 W IB2012057188 W IB 2012057188W WO 2014091276 A1 WO2014091276 A1 WO 2014091276A1
Authority
WO
WIPO (PCT)
Prior art keywords
boards
panel
core board
interval
wall
Prior art date
Application number
PCT/IB2012/057188
Other languages
English (en)
Inventor
Erik Birger Ipsen
Niels Peter JACOBSEN
Original Assignee
Knauf A/S
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 Knauf A/S filed Critical Knauf A/S
Priority to PCT/IB2012/057188 priority Critical patent/WO2014091276A1/fr
Publication of WO2014091276A1 publication Critical patent/WO2014091276A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/86—Sound-absorbing elements slab-shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
    • E04B2/74—Removable non-load-bearing partitions; Partitions with a free upper edge
    • E04B2/7407—Removable non-load-bearing partitions; Partitions with a free upper edge assembled using frames with infill panels or coverings only; made-up of panels and a support structure incorporating posts
    • E04B2/7409—Removable non-load-bearing partitions; Partitions with a free upper edge assembled using frames with infill panels or coverings only; made-up of panels and a support structure incorporating posts special measures for sound or thermal insulation, including fire protection
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
    • E04B2/74—Removable non-load-bearing partitions; Partitions with a free upper edge
    • E04B2/7407—Removable non-load-bearing partitions; Partitions with a free upper edge assembled using frames with infill panels or coverings only; made-up of panels and a support structure incorporating posts
    • E04B2/7448—Removable non-load-bearing partitions; Partitions with a free upper edge assembled using frames with infill panels or coverings only; made-up of panels and a support structure incorporating posts with separate framed panels without intermediary posts, extending from floor to ceiling
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8423—Tray or frame type panels or blocks, with or without acoustical filling
    • E04B2001/8433—Tray or frame type panels or blocks, with or without acoustical filling with holes in their face
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8423—Tray or frame type panels or blocks, with or without acoustical filling
    • E04B2001/8452—Tray or frame type panels or blocks, with or without acoustical filling with peripheral frame members

Definitions

  • the present invention pertains to an acoustic wait panel.
  • Wall panels have undergone a tremendous development during the last decades due to increasing demands regarding fire standards, acoustic and constructive mechanical pro erties.
  • US 4,538,390 is disclosed a wall system for inner walls used in residential houses.
  • the wall panels comprise a gypsum plate, which is sandwiched between two outer panels made from glass fiber boards on each side.
  • the panels of this wall system are assembled at the Job site and would require a rather time consuming assembly process by skilled craftsmen, such as carpenters.
  • a fire resistant partition wall of a building comprises two internal gypsum partition boards disposed with a certain interval provided between them, and two external gypsum partition boards with a certain interval provided from the internal partition boards, so as to form three dosed spaces,
  • the middle space is filled with a sound insulating material, such as glass wool.
  • the position of an internal partition portion disposed on one side does not coincide with the position of an internal partition portion disposed on the other side.
  • a gyp- sum reinforcing board is adhered by an adhesive to the external face of the internal partition portion.
  • EP 1 007 803 pertains to a fire resistant wall structure comprising two rows of spaced vertical supports or studs (Li-profiles ⁇ , in which the rows of studs are separated by a central layer of fire resisting building board, to which the studs of both rows are secured, while the opposite outer faces of the studs are covered by respective facing layers of fire resisting building board secured to the studs.
  • the thickness of the central layer is greater than that of either of the facing layers.
  • US 2008/011 S442 relates to a ⁇ composite sandwich wall panel comprising; two outer panels formed from fine sand gypsum or concrete, in each of which a glass fiber web is disposed at the center, and one centra! panel formed by the same materials as mentioned above. Between the central panel and each of the two outer panels is placed a polystyrene panel, which is bonded to the sand gypsum panels.
  • the wall panel of the present invention has advantages of good performance of thermal insulation and sound insulation. Furthermore, it is fireproof as well as suitable for use as internal wall and external wall. The outer panels are however not perforated.
  • WO 2011/123058 is disclosed a wall section for use as partition walls in apartment buildings and commercial buildings.
  • the wall section comprises a ferro concrete member disposed between a first sideboard and a second sideboard.
  • the first sideboard and the second sideboard may be mechanically fastened to the ferro concrete member. Alternatively, the may also be fastened to the ferro concrete member using chemical adhesives.
  • a gap between the ferro concrete member and one or more of the first and the second sideboards may be filled with insulation material, such as rock woo!.
  • the sideboards may comprise any one of dry board, fiber glass, cement boards, o recycled dry boards.
  • WO 2009/105468 discloses a construction panel system comprising a first panel of one or more construction panels.
  • the first construction panel comprises a core board, a fsrst insulation layer (comprising rock wool) coupled to a first side of the core board, and a second insulation layer coupled to a second side of the core board, where the core board provides a structural integrity for the first panel, the first insulation layer covers the first side of the core board, and the second insulation layer covers the second side of the core board, it is disclosed that the core board could be a USB, plywood, etc., which is not fireproof. Furthermore, if is nowhere disclosed that the outer sideboards could be perforated. in Scandinavian building legislation regarding schools and kindergartens, there is a demand for placing absorbers on the walls in order to get short reverberation times and less sound reflections.
  • a wall panel comprising a core board, first and second outer boards, an insulation layer disposed between the core board and each of the first and second outer boards, wherein at least one of the outer boards comprises at least one perforated region.
  • the panel according to the invention By using perforated outer panels, an increased reduction in reverberation is also achieved. This, as well as the fact that the panel is formed as a "double-wall* panel with insulation on each side of a core board, makes the panel according to the invention particularly well suited as a partition wall between school rooms, where reverberation from especially babble noise can be a significant problem.
  • the layers of boards and insulation have a symmetrical cross section in relation to the core board. Investigations performed by the applicant have surprisingly shown that a symmetrically layered construction of a wail pane! has very good sound reduction properties, as explained above.
  • the core board is substantially thicker than one of the outer boards.
  • the perforated region covers a major part of the at least one outer board.
  • the perforated region covers more than 70% or more than 80% of the total area of said outer board.
  • the core board is composed of at least two boards, which are fastened to each other. These at !east two boards are preferably fire retardant boards. In a further embodiment, these two boards may be composed of glass fiber reinforced gypsum. This offers a cheap way to provide a fire retardant panel, which is also easy to work with.
  • the core board and outer boards are separated from each other by a plurality of spacer elements, such as U-profi!es, to which the boards are attached.
  • spacer elements are preferably made from steel or aluminium.
  • the thickness of each of the insulating layers may be in the interval from 40 mm to 80 mm, preferably in the interval from 45 mm to 55 mm, such as 50 mm.
  • the iotai thickness of the panel is in the interval from 110 mm to 180 mm, preferably in the interval from 125 mm io 165 mm, even more preferably in the interval from 140 mm to 150 mm, such as 145 mm.
  • each of the oute boards has a thickness in the interval from 10 mm to 20 mm, such as 15 mm.
  • the core board is at least twice as thick as each of the outer boards.
  • the core board has a thickness in the inter- va! between 20 mm and 40 mm.
  • the outer boards are composed of gypsum.
  • the perforations are embodied as a plurality of holes, the number and size of which are chosen in dependence of the sound dampening and reverberation dampening requirements that apply In the place wherein the wall panel is to be used.
  • the insulation layers are composed of glass wool or rock wool.
  • said panel is manufactured as one single module ready to mount on its place of intended use.
  • the core board has a higher density than any of the two outer boards.
  • the core board has a fire rating of at least 60 minutes according to the standard EN ⁇ 364-1.
  • the whole panel has a fire rating of at least 60 minutes according to the standard EN 1384-1.
  • the whole pane! has a fire rating of at least 90 minutes according to the standard EN 1364-1, in a preferred embodiment, the wa!S panel has a weighted sound reduction index of at least 45 B, preferably 48 dB.
  • a wall comprising a plurality of wall panels according to any of the embodiments described in the present patent specification.
  • the step of providing the core board comprises the sub step of forming a core board by attaching at least two tdenticai boards to each other in order to provide one single unit having a thickness, which is at least twice the thickness of the individual boards.
  • the at ieast two identical boards are fire re- tardant boards, in a further embodiment of the method, each of the at least two boards are composed of glass fiber reinforced gypsum.
  • the spacer elements are made from steel or aluminium.
  • the combined thickness of eac of the insulating layers is in the interval from 40 mm to 80 mm. preferably in the interval from 45 mm to 55 mm, such as 50 mm.
  • the total thickness of the pane! is in the intervai from 110 mm to 180 mm, preferabl in the interva! from 25 mm to 185 mm, even more preferably in the intervai from 140 mm to 150 mm, suc as 145 mm.
  • each of the outer boards has a thickness in the intervai from 10 mm to 20 mm, such as 15 mm.
  • the core board is at Ieast twice as thick as each of the outer boards.
  • the core board has a thickness in the interval between 20 mm to 40 mm.
  • the outer boards are composed of gypsum.
  • the perforations are embodied as a plurality of hoies, the number and size of which are chosen in dependence of the sound dampening and reverberaiion dampening requirements that apply in the place wherein the wall pane! is to be used.
  • the insulaiion layers are composed of glass wool or rock wool.
  • said panel is man- ufactured as one single module ready to mount on its place of intended use.
  • the core board has a higher density than any of the two outer boards.
  • the core board has a fire rating of at least 60 minutes according to the EN 1364-1.
  • the whole panel has a fire rating of at least 60 minutes according to the EN 1364-1. in a further embodiment of the method according to the invention, the whole panel has a fire rating of at least 90 minutes according to the EN 1364-1. in a further embodiment of the method according to the invention, the panel has a weighted so nd reduction index of at least 45 dB, preferably 48 dB.
  • Fig. 1 shows an embodiment of a partial view of an embodiment of a wail panei according to the Invention
  • Fig, 2 shows a cross section of an embodiment of a panel according to the invention
  • Fig. 3 shows how spacer elements are mounted on a core board
  • Fig, 4 shows how spacer elements are mounted on a core board
  • Fig. 5 shows the results of certified fire testing of a panel according to the invention.
  • Fig. 1 shows an embodiment of a partial view of an embodiment of a wall pane! 2 according to the invention.
  • the illustrated wall panel 2 comprises a core board 4, first and a second outer boards 6 (of which only one is visible), an insulation layer 8 disposed between the core board and each of the first and second outer boards 6, wherein the layers of boards 4, 6 and insulation 8 have a symmetrical cross section in relation to the core board 4, wherein the core board 4 is substantially thicker than one of the outer boards 6, and wherein at least one of the outer boards com rises ai least one perforated region 10.
  • the core board 4 and outer boards ⁇ are separated from each other by a piurality of spacer elements 12, to which the boards 4, S are attached.
  • These spacer elements 12 are in the illustrated embodiment asymmetric U-profiles. Hereby the usage of pliable insulation materials for the insulation layers 8 is achieved.
  • the spacer elements 12 are preferably made from steel or aluminium.
  • the illustrated insulation layers 8 are composed of glass wool. However, alternatively, rock wool may be used.
  • Fig, 2 shows a cross section of an embodiment of a panel 2 according to the invention.
  • the panel 2 is symmetrical in relation to a plane, A, extending through the middle of the core board 4 and further being parallel to the core board 4.
  • the thickness of each of the Insulating layers 8 is in the illustrated embodiment 50 mm, and the. total thickness of the panel 2 is 145 mm.
  • the outer boards 8 are composed of gypsum, and the perforations 10 are embodied as a plurality of holes, the number and size of which are chosen in dependence of the sound dampening and reverberation dampening requirements that apply in the place wherein the wail panel 2 is to be used.
  • Fig, 3 and 4 show how the spacer elements 12 are mounted on the core board 4,
  • the core board 4 is composed of two boards 14, which are fastened to each other, for example by a pluralit of screws. These two boards 14 are preferably fire retardant boards 14, which are composed of glass fiber reinforced gypsum. This offers a cheap way to provide a fire retardant panel 2, which is also easy to work with.
  • the illustrated boards 14 have a thickness of 12.5 mm and a density of 1358 kg per cubic meters, in the illustrated embodiment, the outer boards 8 have the same thickness as the boards 14, but have a lower density.
  • the illustrated spacer elements 12 are embodied as asymmetric U ⁇ profiles, wherein one 20 of the flanges is longer than the other 22,
  • the spacer element 12 is fastened to the core board 4 by a screw 16, which is screwed into the long flange 20 of the spacer element 12. Then - as illustrated in Fig. 4 - another spacer element 12 is fastened to the other side of the core board 4.
  • the illustrated panel 2 is manufactured as one single module ready to mount on its place of intended use. Hereby is achieved a panel 2 which may be mounted in a less time consuming manner, and thereby may effectively com- pete in terms of cost, assembly time and skilled labor requirements as compared to the current widespread construction methods.
  • the Noise Reduction Coefficient (commonly abbreviated NRC) is a scalar representation of the amount of sound energy absorbed upon striking a particular surface. Accordingly, an NRC of 0 indicates perfect reflection, and an NRG of 1 indicates perfect absorption.
  • the NRC is the arithmetic average rounded to the nearest multiple of 0.05 of the sound absorption coefficients for a specific material determined at the one-third octave band at the center frequencies of 250, 500, 1QO0 and 2000 Hz.
  • the sound absorption coefficients of materials are commonly determined through the use of standardized testing procedures, such as AST A C423, which are used to evaluate the sound absorption of maierials in eighteen one-ihird octave frequency bands with center frequencies ranging from 100 Hz to 5000 Hz.
  • Sound absorption coefficients used to calculate NRC are commonly determined in reverberation rooms of qualified acoustical laboratory test facilities using samples of the particular materials of specified size and appropriate mounting.
  • NRC is most commonly used to rate general acousticai properties of acoustic ceiling tiles, baffles, banners, office screens, and acoustic wall panels. It is occasionally used to rate floor coverings and construction materials. NRC is intended to be a simplified acousticai rating of room construction and finish materials when the acoustic objectives of the space are less than sensitive.
  • a wall panel according to the invention without compromising the total thickness of the wall, i.e. a rather thin wail pane! (no thicker than standard walls in school buildings today), having a sound reduction index of at least 48 dS and fire ratings of minimum 60 minutes.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Building Environments (AREA)

Abstract

L'invention porte sur un panneau de paroi (2), lequel panneau comprend une plaque de cœur (4), des première et seconde plaques externes (6), et une couche d'isolation (8) disposée entre la plaque de cœur (4) et chacune des premier et second plaques externes (6). Les couches de plaques (4, 6) et d'isolation (8) ont de préférence une section transversale symétrique par rapport à la plaque de cœur (4), et la plaque de cœur (4) est de préférence sensiblement plus épaisse que l'une des plaques externes (6), au moins l'une des plaques externes (6) comprenant au moins une région perforée (10). L'invention porte également sur un procédé d'assemblage d'un tel panneau, et sur une paroi comprenant une pluralité de tels panneaux.
PCT/IB2012/057188 2012-12-11 2012-12-11 Panneau de paroi acoustique WO2014091276A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2012/057188 WO2014091276A1 (fr) 2012-12-11 2012-12-11 Panneau de paroi acoustique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2012/057188 WO2014091276A1 (fr) 2012-12-11 2012-12-11 Panneau de paroi acoustique

Publications (1)

Publication Number Publication Date
WO2014091276A1 true WO2014091276A1 (fr) 2014-06-19

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Family Applications (1)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014042735A2 (fr) 2012-06-28 2014-03-20 United Technologies Corporation Composant de moteur à turbine à gaz doté d'une fente d'évacuation à géométrie ovale
CN105178477A (zh) * 2015-07-15 2015-12-23 杰森石膏板（嘉兴）有限公司 龙骨、应用龙骨的隔音系统及其制作方法
US20170255178A1 (en) * 2016-03-01 2017-09-07 Wall.A.Be Inc. Smart wall
CN110258909A (zh) * 2019-07-03 2019-09-20 重庆盛厦果时科技有限公司 一种装配式抗震建筑墙板
US11339572B1 (en) 2017-01-23 2022-05-24 Gold Bond Building Products, Llc Method of manufacturing gypsum board with improved fire

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR893678A (fr) * 1943-12-09 1944-08-11 élément de construction isolant
BE665063A (fr) * 1964-06-10 1965-10-01
US4538390A (en) 1982-09-30 1985-09-03 Owens-Corning Fiberglas Corporation Insulation and partition means for existing building
EP0260028A1 (fr) 1986-09-09 1988-03-16 Iwatani Sangyo Kabushiki Kaisha Cloison de séparation résistante au feu pour bâtiment
US5009043A (en) * 1990-07-12 1991-04-23 Herman Miller, Inc. Acoustic panel
EP1007803A1 (fr) 1998-06-08 2000-06-14 BPB plc Mur resistant au feu
US20080115442A1 (en) 2003-01-28 2008-05-22 Chi Wai Cheng Composite Sandwich Wall Panel
WO2009105468A2 (fr) 2008-02-19 2009-08-27 Gibson A David Système de panneau de construction et son procédé de fabrication
WO2011123058A1 (fr) 2010-03-30 2011-10-06 Housing & Development Board Section de paroi

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR893678A (fr) * 1943-12-09 1944-08-11 élément de construction isolant
BE665063A (fr) * 1964-06-10 1965-10-01
US4538390A (en) 1982-09-30 1985-09-03 Owens-Corning Fiberglas Corporation Insulation and partition means for existing building
EP0260028A1 (fr) 1986-09-09 1988-03-16 Iwatani Sangyo Kabushiki Kaisha Cloison de séparation résistante au feu pour bâtiment
US5009043A (en) * 1990-07-12 1991-04-23 Herman Miller, Inc. Acoustic panel
EP1007803A1 (fr) 1998-06-08 2000-06-14 BPB plc Mur resistant au feu
US20080115442A1 (en) 2003-01-28 2008-05-22 Chi Wai Cheng Composite Sandwich Wall Panel
WO2009105468A2 (fr) 2008-02-19 2009-08-27 Gibson A David Système de panneau de construction et son procédé de fabrication
WO2011123058A1 (fr) 2010-03-30 2011-10-06 Housing & Development Board Section de paroi

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014042735A2 (fr) 2012-06-28 2014-03-20 United Technologies Corporation Composant de moteur à turbine à gaz doté d'une fente d'évacuation à géométrie ovale
CN105178477A (zh) * 2015-07-15 2015-12-23 杰森石膏板（嘉兴）有限公司 龙骨、应用龙骨的隔音系统及其制作方法
US20170255178A1 (en) * 2016-03-01 2017-09-07 Wall.A.Be Inc. Smart wall
US11339572B1 (en) 2017-01-23 2022-05-24 Gold Bond Building Products, Llc Method of manufacturing gypsum board with improved fire
US12031328B2 (en) 2017-01-23 2024-07-09 Gold Bond Building Products, Llc Method of manufacturing gypsum board with improved fire resistance
CN110258909A (zh) * 2019-07-03 2019-09-20 重庆盛厦果时科技有限公司 一种装配式抗震建筑墙板

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