JP3707764B2 - Deck plate joining method with electromagnetic shielding performance - Google Patents

Description

【００２６】
図５（Ａ）は、デッキプレート１を水平方向に並べて接合する場合の実施例を示し、図５（Ｂ）は同様なデッキプレートの従来の接合方法を示す。
【００２７】
【発明の効果】
以上詳細に説明したように、本発明の電磁シールド性能を有するデッキプレート接合方法は、真綿状シールド材を接合すべき隣接デッキプレートの対応接合部の間に所定量だけ敷き均せば足りるので、次のような効果を奏する。
【００２８】
（イ）真綿状シールド材を敷詰め又は敷き均すのみで足り、固定工程がないのでデッキプレートの接合作業が容易になる。
（ロ）材料単価が安いと共に、施工手間が少なく、低コスト化が可能になる。
（ハ）従来のリベットを必須とする方法に比し、複数箇所での同時施工が容易であり短工期化を図ることができる。
（ニ）真綿状シールド材の敷詰めと隣接デッキプレートの対応接合部の重ね合わせ作業のみで足り、溶接やはんだ付けを要しない。
【図面の簡単な説明】
【図１】は、本発明のデッキプレート接合方法の説明図である。
【図２】は、細長い導電性繊維の束を削り出す方法の説明図である。
【図３】は、電波減衰量を測定する方法の説明図である。
【図４】は、真綿状シールド材の電波減衰量の測定値を示すグラフである。
【図５】は、本発明の更に他の実施例を示す説明図である。
【図６】は、従来方法の説明図である。
【符号の説明】
１…デッキプレート 2A、2B…接合部
３…リベット ４…ガスケット
５…真綿状シールド材 ７…亜鉛テープ
９…接合層 11…材料金属板
12…切削工具 13…長細い繊維の束
14…固定装置 15…金属板
16…電波暗室 17…試験片取付窓
18…試験電波送信器 19…試験電波受信器[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a deck plate joining method having electromagnetic shielding performance, and more particularly to a deck plate joining method having electromagnetic shielding performance which is easy to construct and gives a large attenuation in the VHF and UHF bands.
[0002]
[Prior art]
With the progress of computerization, the number of intelligent buildings equipped with radio wave communication functions will increase, and in addition to the spread of digital information communication and simple mobile phones (PHS), from the aspects of confidentiality, prevention of interference, and efficient use of radio waves Opportunities to provide electromagnetic shielding spaces inside buildings are increasing. The electromagnetic shielding space is configured by surrounding all the wall surfaces in addition to the floor surface and the ceiling surface with a conductive material without gaps.
[0003]
In recent years, as a construction method for enclosing all the wall surfaces with a conductive material without gaps, an electromagnetic shield construction method using a building structural member has been proposed for the purpose of reducing the cost and shortening the construction period. As a typical example, a metal member such as the deck plate 1 or the fabricated deck plate shown in FIG. 6 is often used as an electromagnetic shielding material for a ceiling surface or a floor surface. However, the joining (fitting) surfaces of the deck plate 1 and the fabricated deck plate satisfy the performance sufficiently by mere superposition in terms of structure, but are electrically used for the purpose of electromagnetic shielding. It is necessary to connect securely.
[0004]
For this reliable connection, conventionally, as shown in FIG. 6, with respect to the joining (fitting) surface between the joining portions 2A and 2B of the adjacent deck plate 1 joined through the gasket 4 as necessary, The rivet 3 was driven, spot welded, or the adhesive zinc tape 7 shown in FIG. 5B was attached.
[0005]
[Problems to be solved by the invention]
However, in order to ensure electrical connection between the adjacent deck plates 1, the driving of the rivets 3, spot welding, or application of zinc tape 7 is troublesome, and the construction process is greatly affected. Was a bottleneck.
[0006]
Accordingly, an object of the present invention is to provide a joining method in which construction of a deck plate having electromagnetic shielding performance is easy.
[0007]
In order to solve the above problems, the present inventor has paid attention to a fluffy shield material made of elongated conductive fibers. The cotton-like shield material 5 in FIG. 1 is made of a large number of long and thin fibers 5A such as copper, brass, stainless steel, iron-chrome alloy, carbon, etc. having a diameter of 40 to 100 μm so that the cotton is made by stretching the cocoon. They are spread and leveled as a bundle 13 that is aligned in the vertical direction and developed like a cotton. Here, the fluffy shape means that a large number of elongated fibers can bend flexibly while being in electrical contact with each other through micro gaps in the length direction, and can be expanded in the thickness and width directions perpendicular to the length direction of the fibers. The state that exists. The silk-like shield material 5 has a shielding ability against electromagnetic waves because a large number of elongated conductive fibers are in electrical contact with each other through minute gaps, and is simply deployed on a metal surface such as a floor panel. Demonstrate shielding ability just by placing.
[0008]
The radio wave shielding ability of the fluffy shield material 5 was verified by measurement.
[0009]
[Measurement example]
Referring to FIG. 2, a metal plate 11 made of brass (Cu65%, Zn35%) is cut with a cutting tool 12, and conductive fibers 5A having a length equal to the length of the metal plate 11 are cut out to form elongated fibers. A bundle 13 of 5A was prepared. This elongated fiber 5A is cut into a length of 500 mm with a scissors and spread while being aligned in the length direction. It is a cushion with a square bottom with a side of 500 mm, and the density of the conductive fiber 5A per bottom unit area is 500 g (500 g / m ² ) A test piece 5B of a fluffy shield material was made.
[0010]
In addition, as shown in FIG. 3, a anechoic chamber 16 in which the electromagnetic attenuation between the inside and outside is 100 dB or more is made using a double structure surrounding wall made of two metal plates 15, and a test piece window 17 of the dark room 16 is provided. The true cotton-like shield material test piece 5B was attached by the fixing device 14. The fixing device 14 attaches the test piece 5B to the anechoic chamber 16 with variable pressure without reducing the radio wave attenuation capability of the test piece 5B. Test radio wave transmitter 18 transmits a 0.15-3.15 GHz band radio wave at a known transmission level toward test piece 5B, transmits it into test room 5B, and then receives it in test room 5B. The level was measured with a test radio wave receiver 19. The attenuation (dB) of the test piece 5B was calculated from the difference between the test radio wave reception level measurement value with the test piece 5B removed and the test radio wave reception level measurement value with the test piece 5B attached. .
[0011]
An example of the measurement result is shown in FIG. FIG. 4 (A) shows a case where the periphery of the test piece 5B is simply brought into electrical contact with the metal plate 15 around the test piece window 17, and the attenuation of the test piece 5B is approximately 40 dB in the 0.15 to 3.15 GHz band. Met.
[0012]
FIG. 4B shows a case where the periphery of the test piece 5B is pressed with such a pressure Le that the metal-only bonding layer 9 is formed with substantially no gap. In this test, the entire periphery of the test piece 5B was pressed against the metal plate 15 around the test piece window 17 over a width of 50 mm. The attenuation amount of the test piece 5B in the case of continuous pressing at the entire periphery was 60 dB or more in the above frequency band.
[0013]
FIG. 4 (C) shows, for comparison, the case where the fixing pressure Ld is applied to a plurality of portions with a gap G on the test piece 5B instead of the entire periphery of the test piece 5B, that is, the length direction of the test piece periphery. A portion of the distance L to which the pressure Ld is applied and a portion of the substantially non-pressurized gap G are alternately provided. In this measurement example, L = 150 mm, the interval G = 100 mm, the pressure Ld was applied over a width of 50 mm as in FIG. 4B, and the value was set to Ld = 150 g / 75 cm ² = 2 g / cm ² . . The attenuation amount of the test piece 5B in the case of this discontinuous pressing was also 60 dB or more in the frequency band.
[0014]
From the measurement example of FIG. 4, the fluffy shielding material 5 exhibits a radio shielding ability of about 40 dB simply by placing it on a floor slab or the like, and its peripheral edge is appropriately continuous or discontinuous to a metal wall surface of a suitable radio wave shielding room. It can be seen that the radio wave shielding ability of 60 dB or more is exhibited if pressed.
[0015]
The present invention has been completed based on the knowledge of the measurement results.
[0016]
The deck plate joining method having electromagnetic shielding performance of the present invention shown in FIG. 1 is the same as the method for joining the deck plates with the joint portions 2A and 2B to the adjacent deck plate 1 and the corresponding joint portions 2A and 2B of the adjacent deck plate 1. A bundle 13 of fibers 5A , in which a large number of long and thin conductive fibers are aligned in the length direction and expanded in a cotton-like shape, is formed into a plurality of conductive fiber layers in which the directions of the elongated fibers 5A are different , and the required electromagnetic This is formed by spreading the cotton shield material 5 at a ratio sufficient to develop the shielding performance, and the opposing surfaces of the cotton-like shield material 5 are brought into contact with the corresponding joint portions 2A and 2B of the adjacent deck plate 1.
[0017]
Preferably, when the required electromagnetic shielding performance is 40 dB or more in the 0.15 to 3.15 GHz band, the ratio of the fluffy shielding material 5 laid between the corresponding joints 2A and 2B of the adjacent deck plate 1 is 300 to 1000 g / and the ratio of m ^2. In this case, spread leveling proportion sufficient electromagnetic shielding effect is less than 300 g / m ² of the floss-like shielding material 5 is difficult to obtain, also use the floss-like shielding material 5 in an amount in excess of 1000 g / m ² Even so, it is difficult to obtain an increase in electromagnetic shielding commensurate with the excess amount of the fluffy shielding material 5.
[0018]
More preferably, the elongate fiber 5A (see FIG. 2) of the silk-like shield material 5 is 40 to 100 μm in diameter made of one or more materials selected from the group consisting of copper, brass, stainless steel, iron / chrome alloy, and carbon. Of fiber.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Referring to the embodiment of FIG. 1, according to the present invention, a bundle 13 of fibers 5A in which a large number of elongate conductive fibers are aligned in the length direction and developed in a cotton-like shape is connected to a corresponding joint 2A of the adjacent deck plate 1. It shall be the floss-like shielding material 5 on one 2B and 2B are spread at a rate sufficient for expression of the desired electromagnetic shielding performance. On top of that, as shown by the arrow V, the other joint 2A, 2B of the adjacent deck plate 1 is overlapped with the other 2A, and the opposing surface of the fluffy shield material 5 is the corresponding joint 2A, 2B of both deck plates 1. Contact. A load due to the weight of the deck plate 1 and slab / concrete is applied between the joints 2A and 2B. As is apparent from this configuration, the present invention is easy to attach the electromagnetic shielding material 5 and provides the required electromagnetic shielding performance. Furthermore, since the fluff-like shield material 5 is simply spread and does not use fixing means, the construction is extremely easy.
[0020]
Therefore, provision of the “joining method in which the construction of the deck plate having electromagnetic shielding performance is easy” which is the object of the present invention is achieved.
[0021]
【Example】
According to the deck plate joining method having electromagnetic shielding performance of the present invention, the bundle 13 of conductive elongated fibers 5A shown in FIG. 2 is carried to the position of the adjacent deck plate 1 to be joined as shown in FIG. The fiber 5A is spread or spread on one of the corresponding joints 2A and 2B at a rate of ˜1000 g / m ² to form a fluffy shield material 5. It is sufficient if the corresponding joint portions 2A of the other adjacent deck plate 1 to be joined are superposed on each other and the opposing surfaces of the true cotton-like shield material 5 are brought into contact with the corresponding joint portions 2A and 2B of both deck plates 1. The amount of the conductive elongated fibers 5A in the true cotton-like shield material 5 can be, for example, about 20 mm in thickness in a free state.
[0022]
According to the present invention, as compared with the conventional method, the affixing operation of the zinc tape 7 in FIG. 5B and the driving operation of the rivet 3 in FIG. 6 are not required, and the construction becomes very simple, shortening the construction period and cost. Savings are possible.
[0023]
Preferably, a plurality of conductive fiber layers having different directions of the elongated fibers 5A can be provided on the cotton-like shield material 5 so as to cope with the diversity of polarization planes of incoming radio waves to be shielded.
[0024]
Table 1 shows examples of the elongated fibers 5A of the cotton-like shield material 5 that can be used in the present invention.
[0025]
[Table 1]

[0026]
FIG. 5 (A) shows an embodiment in which the deck plates 1 are joined in a horizontal direction, and FIG. 5 (B) shows a conventional joining method of the same deck plates.
[0027]
【The invention's effect】
As described in detail above, the deck plate joining method having electromagnetic shielding performance according to the present invention suffices if a predetermined amount is spread between the corresponding joints of adjacent deck plates to which the cotton-like shield material is to be joined. The following effects are produced.
[0028]
(B) It is only necessary to spread or level the lining-like shield material, and since there is no fixing step, it is easy to join the deck plates.
(B) The unit price of the material is low, the construction work is less, and the cost can be reduced.
(C) Compared with the conventional method in which rivets are essential, simultaneous construction at a plurality of locations is easy and the construction period can be shortened.
(D) It is only necessary to lay down the cotton-like shield material and superimpose the corresponding joints of the adjacent deck plates, and no welding or soldering is required.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a deck plate joining method according to the present invention.
FIG. 2 is an explanatory view of a method for scraping a bundle of elongated conductive fibers.
FIG. 3 is an explanatory diagram of a method of measuring radio wave attenuation.
FIG. 4 is a graph showing measured values of radio wave attenuation of a fluffy shield material.
FIG. 5 is an explanatory view showing still another embodiment of the present invention.
FIG. 6 is an explanatory diagram of a conventional method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Deck plate 2A, 2B ... Joint part 3 ... Rivet 4 ... Gasket 5 ... Cotton-like shield material 7 ... Zinc tape 9 ... Joining layer 11 ... Material metal plate
12 ... Cutting tool 13 ... A bundle of long thin fibers
14 ... Fixing device 15 ... Metal plate
16… Anechoic chamber 17… Test specimen mounting window
18 ... Test radio transmitter 19 ... Test radio receiver

Claims (4)

In the method of joining a deck plate with a joint with an adjacent deck plate, a bundle of fibers in which a number of long and thin conductive fibers are aligned in the longitudinal direction and developed into a cotton-like shape between the joints of the adjacent deck plate is elongated. as the orientation of the fibers is different conductive fiber layer, and the required electromagnetic shielding performance on average spread at a rate sufficient for the expression of a floss-like shielding material, said adjacent deck plate surface facing said vacuum flocculent shielding material A deck plate joining method having electromagnetic shielding performance in contact with a joint. The joining method of claim 1, the deck plate bonding method having an electromagnetic shielding performance comprising a ratio sufficient for expression of the desired electromagnetic shielding performance in leveling paved the floss-like shielding material as 300~1000g / m ^2. 3. The bonding method according to claim 1, wherein the conductive fiber is a fiber having a diameter of 40 to 100 μm made of one or more materials selected from the group consisting of copper, brass, stainless steel, iron / chrome alloy, and carbon. Deck plate joining method with electromagnetic shielding performance. In any bonding method of claims 1 to 3, deck plate bonding method having an electromagnetic shielding performance composed as above 60dB in the frequency band of 0.15~3.15GHz electromagnetic wave attenuation of the bonded deck plate.

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