CN108756053B - Prefabricated slab with electromagnetic shielding layer and manufacturing method thereof - Google Patents
Prefabricated slab with electromagnetic shielding layer and manufacturing method thereof Download PDFInfo
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- CN108756053B CN108756053B CN201810650529.6A CN201810650529A CN108756053B CN 108756053 B CN108756053 B CN 108756053B CN 201810650529 A CN201810650529 A CN 201810650529A CN 108756053 B CN108756053 B CN 108756053B
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- 239000011248 coating agent Substances 0.000 claims description 19
- 238000000576 coating method Methods 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 13
- 239000003973 paint Substances 0.000 claims description 8
- 239000011231 conductive filler Substances 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 6
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000010432 diamond Substances 0.000 claims description 2
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- 229910003460 diamond Inorganic materials 0.000 claims 1
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- 238000010276 construction Methods 0.000 abstract description 5
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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
- E04C2/26—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
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- 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
- E04B1/92—Protection against other undesired influences or dangers
-
- 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
- E04B1/92—Protection against other undesired influences or dangers
- E04B2001/925—Protection against harmful electro-magnetic or radio-active radiations, e.g. X-rays
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Building Environments (AREA)
Abstract
The invention discloses a precast slab with an electromagnetic shielding layer and a manufacturing method thereof. According to the invention, the electromagnetic shielding layer and the concrete are prefabricated into the prefabricated slab, and the prefabricated slab can be directly used for the assembly construction of the electromagnetic shielding room without constructing the electromagnetic shielding room in the later period; the double-layer electromagnetic shielding layer is arranged to play a better role in shielding electromagnetic pulses, the electromagnetic shielding layer is connected with the gasket, and the gasket is positioned at the side surface electromagnetic shielding layer of the prefabricated plates, so that the electromagnetic shielding layers of the two prefabricated plates can be connected into a whole, the electromagnetic protection performance is greatly improved, and electromagnetic signals inside and outside a building can be effectively shielded.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a prefabricated slab with an electromagnetic shielding layer and a manufacturing method thereof.
Background
With the rapid development of scientific technology and electronic industry, various digital and high-frequency electronic and electrical devices radiate electromagnetic waves with a large number of frequencies with different wavelengths into the space during working, thereby causing new environmental pollution, namely electromagnetic wave interference and radio frequency or radio interference. Meanwhile, electronic components are also being developed in the direction of miniaturization, light weight, digitalization and high density integration, and the sensitivity is higher and higher, so that the electronic components are easily subjected to external electromagnetic interference, and misoperation, image obstruction, sound obstruction and the like are caused. Electromagnetic interference generated by electromagnetic radiation only affects the performance of electronic products, and electromagnetic pollution caused by the electromagnetic interference causes serious harm to human beings and other organisms, so that the high-frequency electronic and electrical equipment needs to be shielded.
The existing electromagnetic shielding room construction process mainly comprises the steps of firstly carrying out on-site measurement, then carrying out design and production according to measurement data, and then carrying out decoration and installation on site, and has the disadvantages of complex process, long construction period and high cost.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a precast slab with an electromagnetic shielding layer and a manufacturing method thereof.
In order to achieve the purpose, the technical scheme of the invention is to design a precast slab with an electromagnetic shielding layer, wherein a steel bar cage is arranged in the precast slab, the surface of the precast slab is also provided with the electromagnetic shielding layer, the electromagnetic shielding layer is arranged on one side or two sides of the steel bar cage, and the surface and/or the side surface of the precast slab is/are coated with electromagnetic shielding paint containing metal powder.
In daily life, the basic radio waves of daily electric appliances needing electromagnetic shielding have the wavelength of 0.3mm to 3000 m, and the preferred technical scheme is that the electromagnetic shielding layer is a mesh grid structure formed by weaving metal monofilaments in a warp-weft penetrating manner, wherein the mesh wire interval is smaller than 0.3 mm.
Further preferably, the grid of the grid is diamond or square. The metal electromagnetic shielding net with the structure is not only beneficial to enhancing the shielding performance, but also can play a role in reinforcing the concrete structure.
The prefabricated member is internally provided with a steel bar cage, the steel bars mainly bear tensile stress in the prefabricated member, and in order to avoid reduction of the whole bearing stress of the prefabricated member, a more preferable technical scheme is that the distance between the electromagnetic shielding layer and the surface of the prefabricated plate is 1-5 cm.
The preferable technical scheme is that the electromagnetic shielding layer is a thin metal layer, and the thickness of the thin metal layer is 0.03-0.1 mm.
In order to ensure that the electromagnetic shielding coating is uniformly coated and has good electromagnetic shielding effect, the preferable technical scheme is that the conductive filler in the electromagnetic shielding coating is at least one of aluminum powder, iron powder and copper powder, the particle size of the conductive filler is 2-20 microns, the volume percentage of the conductive filler in the electromagnetic shielding coating is 20-30%, and the surface of the electromagnetic shielding coating is coated with a tearable coating protective film. The electromagnetic shielding coating is prepared from synthetic resin, conductive filler and solvent, and is coated on the surface of a base material to form a layer of cured film, so that the conductive shielding effect is achieved. The electromagnetic shielding coating has the advantages of room temperature curing, strong adhesive force, low cost, simplicity, practicality and wide application range. In order to avoid damaging the electromagnetic shielding coating layer when concrete is poured at the joint between the two precast slabs or the precast slabs are hoisted on site, a tearable coating protective film is covered outside the electromagnetic shielding coating layer.
In order to achieve a better electromagnetic shielding effect, a further preferable technical scheme is that the electromagnetic shielding layer is a double layer and is respectively arranged on two sides of the steel bar cage.
In order to ensure that electromagnetic shielding between the precast slabs has no leakage point, a more preferable technical scheme is that an electromagnetic sealing gasket is further embedded outside the side electromagnetic shielding layer of the precast slabs, and the electromagnetic sealing gasket is a conductive cloth gasket. The conductive cloth liner is formed by wrapping a foamed rubber core on conductive cloth, is generally rectangular and is provided with gum, so that the installation is very convenient, and the shielding efficiency is higher at high and low frequencies.
The invention provides a method for manufacturing a precast slab with an electromagnetic shielding layer, aiming at solving the technical problems in the prior art, and the method comprises the following steps:
s1: preprocessing a metal shielding net, namely cutting the metal shielding net into a metal shielding net with the size larger than the surface area of the precast slab, fixing the periphery of the cut metal shielding net on a frame to manufacture a metal shielding net frame, wherein the frame is vertical to the surface of the metal shielding net, and the area of the metal shielding net in the frame is larger than or equal to the surface area of the precast slab;
s2: preparing for prefabrication, binding steel bars of prefabricated plates to form a steel bar cage by adopting the prior art, manufacturing a prefabricated bottom plate, a prefabricated frame and a plastic pressing plate, wherein a through hole is formed in the side edge of the prefabricated frame, a cover plate is arranged outside the through hole, the thickness of the plastic pressing plate is 1-5cm, the peripheral size of the plastic pressing plate is equal to the surface size of the prefabricated plates, the two surfaces of the plastic pressing plate are smooth, and two ends of one surface are provided with hoisting rings;
s3: pouring a precast slab, namely pouring concrete in a precast bottom plate and a precast frame to a position 1-5cm away from the surface of the precast slab, hoisting the plastic pressing plate manufactured in the step S2 to the surface of the poured concrete, opening a cover plate outside a through hole of the precast frame, flattening the plastic pressing plate by a pressing roller, enabling excessive concrete to overflow from the through hole of the precast frame, hoisting the plastic pressing plate, placing a metal shielding net frame on the surface of the concrete, enabling the frame of the net frame to be attached to the inner wall of the precast frame, and pouring the concrete to the designed thickness of the precast slab;
s4: forming the prefabricated plate, curing the prefabricated plate manufactured in the step S3, removing the prefabricated bottom plate and the prefabricated frame after the maintenance of the prefabricated plate is finished, spraying or brushing electromagnetic shielding paint on the surface and the side surface of the prefabricated plate, and naturally airing the paint at room temperature; and then sticking a tearable coating protective film on the surface of the coating, and maintaining the prefabricated plate for later use.
In order to make the metal electromagnetic shielding net more closely combined with concrete during the fabrication of the prefabricated member, without wrinkles, and to make the metal electromagnetic shielding net fully cover the surface of the prefabricated member without leakage, the preferred technical scheme is that the thickness of the frame in the step S1 is 1-3mm, the height is 1-2cm, and the frame is made of plastic or thin metal.
The invention has the advantages and beneficial effects that: according to the invention, the electromagnetic shielding layer and the concrete are prefabricated into the prefabricated slab, and the prefabricated slab can be directly used for the assembly construction of the electromagnetic shielding room without constructing the electromagnetic shielding room in the later period; the double-layer electromagnetic shielding layer is arranged to play a role in shielding electromagnetic pulses, the electromagnetic shielding layer is connected with the gasket, and the gasket is positioned at the electromagnetic shielding layer on the side surface of the prefabricated plate, so that the electromagnetic shielding layers of the two prefabricated plates can be connected into a whole, the electromagnetic protection performance is greatly improved, and electromagnetic signals inside and outside a building can be effectively shielded. Meanwhile, because the metal shielding net is light and soft, the metal shielding net is directly paved on a concrete layer, and the problems of curling, wrinkling and incapability of covering the edge of the prefabricated part can occur.
Drawings
FIG. 1 is a schematic cross-sectional view of an electromagnetic shielding prefabricated panel according to the present invention;
fig. 2 is a schematic structural view of the metal shielding net frame of the electromagnetic shielding prefabricated plate of the invention.
In the figure: 1. electromagnetic shielding coating; 2. an electromagnetic shielding layer; 3. reinforcing steel bars; 4. an electromagnetic seal gasket; 5. and (5) a frame.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
As shown in figure 1, the invention relates to a precast slab with an electromagnetic shielding layer, wherein a steel bar 3 cage is arranged in the precast slab, an electromagnetic shielding layer 2 is also arranged in the surface of the precast slab, the electromagnetic shielding layer 2 is arranged on one side or two sides of the steel bar 3 cage, and the surface of the precast slab is coated with an electromagnetic shielding coating 1 containing metal powder.
The electromagnetic shielding layer 2 is a grid structure formed by weaving metal monofilaments in a warp-weft penetrating manner, wherein the distance between the grid wires is smaller than 0.3 mm. The grids of the grid are square.
An electromagnetic sealing gasket 4 is further embedded on the outer side of the side electromagnetic shielding layer 2 of the prefabricated slab, and the electromagnetic sealing gasket 4 is a conductive cloth gasket.
During on-site assembly construction, after the steel bars 3 between the two prefabricated plates are welded, concrete is cast on site at the joint, and an electromagnetic shielding metal net is pasted on the surface of the cast-in-place concrete or electromagnetic shielding paint is coated or metal strips are buried on the surface of the cast-in-place concrete, so that the electromagnetic shielding layers 2 between the two prefabricated plates are connected, and electromagnetic shielding is free of leakage points.
According to the structural characteristics of the invention, the electromagnetic shielding layer can be used for manufacturing precast beams, precast water pipes, precast steps and the like. The electromagnetic shielding is carried out in all directions and in the whole area in the house, and when the electromagnetic shielding prefabricated member is not laid at the door and window in later-stage building use, the fabric with the electromagnetic shielding function can be hung to be used as a door curtain or a window curtain, so that the electromagnetic shielding without leakage points and full coverage can be carried out.
Example 2
As shown in fig. 2, a method for manufacturing a prefabricated panel having an electromagnetic shielding layer includes the steps of:
s1: preprocessing a metal shielding net, namely cutting the metal shielding net into a metal shielding net with the size larger than the surface area of the prefabricated plate, fixing the periphery of the cut metal shielding net on a frame 5 to manufacture a metal shielding net frame, wherein the frame 5 is vertical to the surface of the metal shielding net, and the area of the metal shielding net in the frame 5 is larger than or equal to the surface area of the prefabricated plate;
s2: preparing for prefabrication, binding steel bars of prefabricated plates to form a steel bar cage by adopting the prior art, manufacturing a prefabricated bottom plate, a prefabricated frame and a plastic pressing plate, wherein a through hole is formed in the side edge of the prefabricated frame, a cover plate is arranged outside the through hole, the thickness of the plastic pressing plate is 1-5cm, the peripheral size of the plastic pressing plate is equal to the surface size of the prefabricated plates, the two surfaces of the plastic pressing plate are smooth, and two ends of one surface are provided with hoisting rings;
s3: pouring a precast slab, namely pouring concrete in a precast bottom plate and a precast frame to a position 1-5cm away from the surface of the precast slab, hoisting the plastic pressing plate manufactured in the step S2 to the surface of the poured concrete, opening a cover plate outside a through hole of the precast frame, flattening the plastic pressing plate by a pressing roller, enabling excessive concrete to overflow from the through hole of the precast frame, hoisting the plastic pressing plate, placing a metal shielding net frame on the surface of the concrete, enabling a frame 5 of the net frame to be attached to the inner wall of the precast frame, and pouring the concrete to the designed thickness of the precast slab;
s4: forming the prefabricated plate, curing the prefabricated plate manufactured in the step S3, removing the prefabricated bottom plate and the prefabricated frame after the maintenance of the prefabricated plate is finished, spraying or brushing electromagnetic shielding paint on the surface and the side surface of the prefabricated plate, and naturally airing the paint at room temperature; and then sticking a tearable coating protective film on the surface of the coating, and maintaining the prefabricated plate for later use.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A method for preparing a precast slab with an electromagnetic shielding layer is characterized by comprising the following steps of:
s1: preprocessing an electromagnetic shielding layer, cutting the electromagnetic shielding layer into a metal shielding layer with the size larger than the surface area of the prefabricated plate, fixing the periphery of the cut metal shielding layer on a plastic or thin metal frame with the thickness of 1-3mm and the height of 1-2cm to form an electromagnetic shielding layer frame, wherein the frame is vertical to the surface of the electromagnetic shielding layer, and the area of the electromagnetic shielding layer in the frame is larger than or equal to the surface area of the prefabricated plate;
s2: preparing for prefabrication, binding steel bars of prefabricated plates to form a steel bar cage by adopting the prior art, manufacturing a prefabricated bottom plate, a prefabricated frame and a plastic pressing plate, wherein a through hole is formed in the side edge of the prefabricated frame, a cover plate is arranged outside the through hole, the thickness of the plastic pressing plate is 1-5cm, the peripheral size of the plastic pressing plate is equal to the surface size of the prefabricated plates, the two surfaces of the plastic pressing plate are smooth, and two ends of one surface are provided with hoisting rings;
s3: pouring the precast slab, namely pouring concrete in the precast bottom plate and the precast frame to a position 1-5cm away from the surface of the precast slab, hoisting the plastic pressing plate manufactured in the step S2 to the surface of the poured concrete, opening the cover plate outside the through hole of the precast frame, flattening the plastic pressing plate by a pressing roller, enabling the excessive concrete to overflow from the through hole of the precast frame, hoisting the plastic pressing plate, placing the electromagnetic shielding layer frame on the surface of the concrete, enabling the frame of the screen frame to be attached to the inner wall of the precast frame, and pouring the concrete to the designed thickness of the precast slab;
s4: forming the prefabricated plate, curing the prefabricated plate manufactured in the step S3, removing the prefabricated bottom plate and the prefabricated frame after the maintenance of the prefabricated plate is finished, spraying or brushing electromagnetic shielding paint on the surface and the side surface of the prefabricated plate, and naturally airing the paint at room temperature; then, sticking a tearable coating protective film on the surface of the coating, and maintaining the prefabricated plate for later use;
the prefabricated slab is internally provided with a steel bar cage, the electromagnetic shielding layer is arranged on one side or two sides of the steel bar cage, and the electromagnetic shielding coating is coated on the surface and/or the side surface of the prefabricated slab.
2. The method for manufacturing a precast slab with an electromagnetic shielding layer according to claim 1, wherein the electromagnetic shielding layer is a grid structure formed by weaving metal monofilaments in a warp-weft penetrating manner and having a mesh wire spacing of less than 0.3 mm.
3. The method for manufacturing a prefabricated panel having an electromagnetic shielding layer according to claim 2, wherein the lattice of the grid has a diamond shape or a square shape.
4. The method for manufacturing a prefabricated panel having an electromagnetic shielding layer according to claim 3, wherein the electromagnetic shielding layer is spaced from the surface of the prefabricated panel by 1-5 cm.
5. The method for manufacturing a prefabricated panel having an electromagnetic shielding layer according to claim 1, wherein the electromagnetic shielding layer is a thin metal layer having a thickness of 0.03-0.1 mm.
6. The method for manufacturing a prefabricated panel with an electromagnetic shielding layer according to claim 4 or 5, wherein the conductive filler in the electromagnetic shielding coating is at least one of aluminum powder, iron powder and copper powder, the particle size of the conductive filler is 2-20um, and the volume percentage of the conductive filler in the electromagnetic shielding coating is 20-30%.
7. The method for manufacturing a prefabricated panel with an electromagnetic shielding layer according to claim 6, wherein the electromagnetic shielding layer is a double layer and is respectively disposed on both sides of the reinforcement cage.
8. The method for manufacturing the precast slab with the electromagnetic shielding layer according to claim 7, wherein an electromagnetic sealing gasket is further embedded outside the side electromagnetic shielding layer of the precast slab, and the electromagnetic sealing gasket is a conductive cloth gasket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810650529.6A CN108756053B (en) | 2018-06-22 | 2018-06-22 | Prefabricated slab with electromagnetic shielding layer and manufacturing method thereof |
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| CN201810650529.6A CN108756053B (en) | 2018-06-22 | 2018-06-22 | Prefabricated slab with electromagnetic shielding layer and manufacturing method thereof |
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| CN108756053B true CN108756053B (en) | 2021-08-27 |
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| CN111506116B (en) * | 2020-05-29 | 2021-08-17 | 中国南方电网有限责任公司超高压输电公司昆明局 | Unmanned aerial vehicle safety control method based on strong magnetic field interference of converter station |
| CN112252580A (en) * | 2020-09-21 | 2021-01-22 | 江苏东尚住宅工业有限公司 | Pre-buried prefabricated plate that has magnet |
| CN116373407A (en) * | 2023-03-10 | 2023-07-04 | 北方长龙新材料技术股份有限公司 | Electromagnetic shielding integrated composite shelter wallboard and manufacturing method |
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| ES2288408B2 (en) * | 2006-04-18 | 2009-05-01 | Pedro Puig Gonzalez | ARMCHAIRS FOR PLUMBING AND CLOSURES OF VERTICAL TYPE. |
| CN204948618U (en) * | 2015-05-13 | 2016-01-06 | 东莞市万丰纳米材料有限公司 | electromagnetic shielding film |
| CN109440958B (en) * | 2017-03-20 | 2020-11-13 | 深圳华筑人居科技有限公司 | Electromagnetic shielding wallboard |
| CN207484812U (en) * | 2017-11-01 | 2018-06-12 | 佛山市美之居装饰材料有限公司 | A kind of electromagnetic shielding wallboard |
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