CN101339818A - Electromagnetic radiation shielding method - Google Patents
Electromagnetic radiation shielding method Download PDFInfo
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- CN101339818A CN101339818A CNA2007100786885A CN200710078688A CN101339818A CN 101339818 A CN101339818 A CN 101339818A CN A2007100786885 A CNA2007100786885 A CN A2007100786885A CN 200710078688 A CN200710078688 A CN 200710078688A CN 101339818 A CN101339818 A CN 101339818A
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Abstract
The invention belongs to the technical field of physics, and in particular relates to an electromagnetic radiation shielding method. The electromagnetic radiation shielding method comprises the following steps: the ambient magnetic field value of the radiation by a transformer is calculated according to the transformer capacity and potential current value of a power distribution room; the size and the dimension of a reinforcement grid are determined; the reinforcements are buried in the corresponding concrete according to the designed reinforcement grids and the size of the reinforcements, thus achieving better electromagnetic radiation shielding. The electromagnetic radiation shielding method guarantees the construction intensity of buildings and better achieves the electromagnetic radiation shielding; further is characterized by low engineering expense and durable building structure, and can be widely applied to the places which need shielding the electromagnetic radiation.
Description
Technical field
The invention belongs to the technical field of physical department, be specifically related to a kind of electromagnetic radiation shielding method.
Background technology
As everyone knows, electromagnetic radiation may damage brain, eyes, heart and internal system to the harm of human body.The United Nations classifies electromagnetic radiation pollution as the fourth-largest pollution source.The standard that the science and technology development planning of national environmental protection Eleventh Five-Year Plan is clearly relevant with Environmental security with electromagnetic radiation is classified the environmental science and technology problem of wanting emphasis to solve as.At present, no matter for complete electronics, electrical equipment or install and use the industry or the covil construction of electronics, electrical equipment, the more and required expense of technological means at alternative solution electromagnetic interference problem of design phase is less, by the time after device fabrication finishes, installs ready or the construction work completion is come into operation, find that just electromagnetic interference (EMI) is serious, make up more when the time comes, then its difficulty and expense will increase greatly.As seen, electromagnetic interference problem has become the design link of necessity of modern construction engineering electrical design.To the anti-electromagnetic interference (EMI) design effect of power distribution room buildings how and power distribution room is the root that produces frequency electromagnetic radiation,, could evaluate according to the test result after being completed.The common practice is to use wire netting or sheet metal at present, and the so not only time-consuming material that takes also influences the outward appearance and the daylighting of buildings; And shield effectiveness yet there are no scientific and reasonable.
Summary of the invention
The purpose of this invention is to provide a kind of electromagnetic radiation shielding method, the present invention does not influence the outward appearance and the daylighting of buildings, and shield effectiveness is good; Not only guarantee the building operation intensity of buildings, and realized ELECTROMAGNETIC RADIATION SHIELDING well; Have simultaneously that engineering cost is low, building structure is durable in use, can be widely used in the place that need carry out ELECTROMAGNETIC RADIATION SHIELDING.
The object of the present invention is achieved like this:
Mainly be that transformer capacity and potential current value according to power distribution room calculates its magnetic field value to ambient radiation; Determine the size and the rebar sizes of steel grid as required; When building operation, according to steel grid that designs and rebar sizes reinforcing bar is embedded in corresponding concrete the inside, not only guarantee the building operation intensity of buildings, and realized ELECTROMAGNETIC RADIATION SHIELDING well.
She Ji power distribution room as stated above, the top board of power distribution room and on every side metope adopt reinforced concrete structure, its reinforcing bar is a reticulate texture, bar-mat reinforcement welds with power distribution room building earthed system.
Beneficial effect of the present invention is:
1, the present invention is by analyzing bar-mat reinforcement and the shield effectiveness of reinforced concrete and the interference source characteristic in architectural electric room, obtain the structural model (comprising bar diameter, steel grid size etc.) of the most satisfactory bar-mat reinforcement and reinforced concrete, the ELECTROMAGNETIC RADIATION SHIELDING effect is quantized.
2, be that country's formulation electromagnetic radiation standard is for referencial use, formulate the standard collective drawings of associated electrical magnetic radiation as country and quote, for important effect is played in the electromagnetic environment assessment.
3, as building materials commonly used, reinforced concrete structure has low, the long-lived characteristics of building structure of engineering cost.Adopt the present invention will effectively reduce construction costs, the development of the national economy is had very high practical significance.
Description of drawings
Fig. 1 is a power distribution room model synoptic diagram.
Fig. 2 is the shield effectiveness that different model reinforcing bar shield effectiveness changes with grid.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are described further:
Electromagnetic radiation shields to power distribution room to use the present invention: at first, calculate its magnetic field value to ambient radiation according to the transformer capacity and the potential current value of power distribution room; Then, determine the size and the rebar sizes of steel grid as required; When building operation, according to steel grid that designs and rebar sizes reinforcing bar is embedded in corresponding concrete the inside, thereby realizes good ELECTROMAGNETIC RADIATION SHIELDING again.
As shown in Figure 1, power distribution room is generally at bottom or subterranean layer, thus consider its to around electromagnetic radiation and to the electromagnetic radiation of top.By adding reinforcing bar to its enforcement shielding at the upper strata of power distribution room floor and its enclosure wall face, the earthed system of bar-mat reinforcement and building must good welding together.
For the certain bar-mat reinforcement shield of size, when conductor diameter is constant and when reducing size of mesh opening, shield effectiveness increases thereupon; When size of mesh opening is constant, increases conductor diameter and can improve shield effectiveness.When size of mesh opening was changed by 0.76*0.7-0.56*0.54 as can be seen from Figure 2, the three compared the variation tendency maximum of No. 8 reinforcing bar shield effectivenesss; And the variation tendency of No. 10 reinforcing bar shield effectivenesss is the fastest when 0.56*0.54-0.28*0.27 changes.As seen increase with grid number, shield effectiveness all is increase tendency.When screen layer was steel plate (size of mesh opening is 0*0), the shield effectiveness of No. 6, No. 8 and No. 10 reinforcing bar correspondences was respectively 32.38dB, 33.52dB, 35.89dB, and corresponding shield effectiveness all can reach more than 97%.Consider in addition in the actual building the requirement of structural safety and construction cost etc., use No. 8 reinforcing bars and size of mesh opening to be no more than 0.10*0.10 (m
2), greater than 4.5dB, shield effectiveness can reach more than 40.48% through the prediction shield effectiveness.At y=2.5m, promptly the corresponding B of the 1.5m in the upper strata (position of human heart) can be less than 3.5 μ T.
For the certain bar-mat reinforcement shield of size, when conductor diameter is constant and when reducing size of mesh opening, shield effectiveness increases thereupon; When size of mesh opening is constant, increases conductor diameter and can improve shield effectiveness.The reinforcing bar model is during from No. 6 to No. 8, and shield effectiveness changes greatly, and shield effectiveness changes less from No. 8 to No. 10.Consider that simultaneously transformer room's bus is relative with the distance of light current machine room far away and to demands such as safety and costs, use No. 8 reinforcing bars and size of mesh opening to be not more than 0.54*0.54 (m
2), shield effectiveness can reach more than 33.82%.Magnetic induction density B=1.37 μ T in that y=3m (the left side wall in right motor room) locates at distance motor house left side wall 0.33m (y=3.33m) afterwards, all can drop to magnetic induction density B below the 1 μ T.
The electromagnetic radiation of buildings power distribution room mainly comes from the outlet of transformer low voltage busbar, and the busbar electric current is big more serious more to the surrounding magnetic field radiation, and electric field radiation is very little, do not consider electric field radiation at this, so propose in the time of architectural design, transformer capacity and potential current value according to power distribution room calculate its magnetic field value to ambient radiation, determine the size and the rebar sizes of steel grid as required, steel grid and rebar sizes according to design in the time of building operation are embedded in corresponding concrete the inside to reinforcing bar, thereby realize good ELECTROMAGNETIC RADIATION SHIELDING.
Because in the world about the physiological effect not accurately explanation of magnetic field to human body, so it is also different that each country requires the magnetic field radiation exposure value, China is 100 μ T to the exposure value of magnetic field radiation now, and western countries require the value of control much lower, and particularly the Swedish architecture council requires the magnetic field radiation of power distribution room will be lower than 0.2 μ T.By this method, will effectively reduce construction costs, the development of the national economy there is very high practical significance, can require to implement different shielding measures according to difference, guarantee that fully people survive at the environment of an electromagnetism harmony.
Claims (2)
1, a kind of electromagnetic radiation shielding method is characterized in that comprising the steps: that transformer capacity and potential current value according to power distribution room calculate its magnetic field value to ambient radiation; Determine the size and the rebar sizes of steel grid; Steel grid and rebar sizes according to design are embedded in corresponding concrete the inside to reinforcing bar, thereby realize good ELECTROMAGNETIC RADIATION SHIELDING.
2, electromagnetic radiation shielding method according to claim 1 is characterized in that its reinforcing bar is a reticulate texture, bar-mat reinforcement and the welding of building earthed system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100786885A CN101339818A (en) | 2007-07-04 | 2007-07-04 | Electromagnetic radiation shielding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100786885A CN101339818A (en) | 2007-07-04 | 2007-07-04 | Electromagnetic radiation shielding method |
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| CN101339818A true CN101339818A (en) | 2009-01-07 |
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| CNA2007100786885A Pending CN101339818A (en) | 2007-07-04 | 2007-07-04 | Electromagnetic radiation shielding method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567525B (en) * | 2009-01-24 | 2012-01-18 | 国网电力科学研究院 | Shielding chamber cable grounding method |
| CN102943534A (en) * | 2012-11-08 | 2013-02-27 | 中国水电顾问集团华东勘测设计研究院 | Electromagnetic radiation integral shielding structure for large space |
| CN105555733A (en) * | 2013-06-24 | 2016-05-04 | 内布拉斯加大学董事会 | Structural concrete mix for construction for electromagnetic wave/pulse shielding |
| CN108152763A (en) * | 2017-12-28 | 2018-06-12 | 上海市计量测试技术研究院 | The measuring device and measuring method of DC magnetic shield effectiveness |
| US10385519B2 (en) | 2016-04-06 | 2019-08-20 | Nutech Ventures | Systems and methods for construction of electrically conductive concrete slab with protection from current leakage |
| CN113392499A (en) * | 2021-05-08 | 2021-09-14 | 中国辐射防护研究院 | Electron linear accelerator machine room radiation shielding and ozone concentration calculating method and device |
-
2007
- 2007-07-04 CN CNA2007100786885A patent/CN101339818A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567525B (en) * | 2009-01-24 | 2012-01-18 | 国网电力科学研究院 | Shielding chamber cable grounding method |
| CN102943534A (en) * | 2012-11-08 | 2013-02-27 | 中国水电顾问集团华东勘测设计研究院 | Electromagnetic radiation integral shielding structure for large space |
| CN102943534B (en) * | 2012-11-08 | 2015-05-06 | 中国水电顾问集团华东勘测设计研究院 | Electromagnetic radiation integral shielding structure for large space |
| CN105555733A (en) * | 2013-06-24 | 2016-05-04 | 内布拉斯加大学董事会 | Structural concrete mix for construction for electromagnetic wave/pulse shielding |
| US10385519B2 (en) | 2016-04-06 | 2019-08-20 | Nutech Ventures | Systems and methods for construction of electrically conductive concrete slab with protection from current leakage |
| CN108152763A (en) * | 2017-12-28 | 2018-06-12 | 上海市计量测试技术研究院 | The measuring device and measuring method of DC magnetic shield effectiveness |
| CN108152763B (en) * | 2017-12-28 | 2020-01-24 | 上海市计量测试技术研究院 | Measuring device and measuring method for direct-current magnetic shielding efficiency |
| CN113392499A (en) * | 2021-05-08 | 2021-09-14 | 中国辐射防护研究院 | Electron linear accelerator machine room radiation shielding and ozone concentration calculating method and device |
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Open date: 20090107 |