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Title:
PAVING MATERIAL FOR ABSORBING ELECTROMAGNETIC WAVE AND PAVEMENT STRUCTURE USING IT
Document Type and Number:
WIPO Patent Application WO/2003/031722
Kind Code:
A1
Abstract:
A base material is admixed with an electromagnetic wave absorber of conductive fibers, e.g. carbon fibers, each having an overall length corresponding to the wavelength of an electromagnetic wave to be absorbed thus composing a paving material for absorbing electromagnetic wave. A paving structure having a layer for absorbing electromagnetic wave is formed using that paving material for absorbing electromagnetic wave. Furthermore, an electromagnetic wave reflective layer is arranged beneath the layer for absorbing electromagnetic wave and set with a specified electric length in relation with the permittivity so that the electromagnetic waves reflected off the surface and off the electromagnetic wave reflective layer have inverse phases and are canceled each other thus absorbing electromagnetic wave well. When the paving structure having a layer for absorbing electromagnetic wave is arranged such that the means permittivity along a plane orthogonal to the thickness direction thereof increases from the surface side toward the rear side, the electromagnetic wave easily intrudes a part on the surface side of a surface layer formed of paving material for absorbing electromagnetic wave. Since the electromagnetic wave reflected directly (direct reflection wave) off the surface of the surface layer formed of the paving material for absorbing electromagnetic wave is decreased and the ratio of electromagnetic wave impinging on the surface layer formed of the paving material for absorbing electromagnetic wave is increased, the electromagnetic wave is absorbed effectively by the layer for absorbing electromagnetic wave.

Inventors:
Saito, Toshio c/o TAKENAKA Research & Development Institute (5-1 Otsuka 1-chom, Inzai-shi Chiba, 270-1352, JP)
Harakawa, Kenichi c/o TAKENAKA Research & Development Institute (5-1 Otsuka 1-chom, Inzai-shi Chiba, 270-1352, JP)
Wakinaka, Yoshitaka c/o TAKENAKA Research & Development Institute (5-1 Otsuka 1-chom, Inzai-shi Chiba, 270-1352, JP)
Kunishima, Takeshi c/o TAKENAKA ROAD CONSTRUCTION CO. LTD. (21-1, Ginza 8-chom, Chuo-ku Tokyo, 104-0061, JP)
Yoshimura, Kenichi c/o TAKENAKA ROAD CONSTRUCTION CO. LTD. (21-1, Ginza 8-chom, Chuo-ku Tokyo, 104-0061, JP)
Fujii, Yoshifumi c/o TAKENAKA CIVIL ENGINEERING & CONSTRUCTION CO. LTD. (21-1, Ginza 8-chom, Chuo-ku Tokyo, 104-8234, JP)
Andoh, Shin-ichiro c/o TAKENAKA CIVIL ENGINEERING & CONSTRUCTION CO. LTD. (21-1, Ginza 8-chom, Chuo-ku Tokyo, 104-8234, JP)
Iwata, Takeo (2-2-1-405, Tadao Machida-shi, Tokyo, 194-0035, JP)
Satou, Masakazu (1876-43, Honmachida Machida-shi, Tokyo, 194-0032, JP)
Application Number:
PCT/JP2001/008532
Publication Date:
April 17, 2003
Filing Date:
September 28, 2001
Export Citation:
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Assignee:
TAKENAKA CORPORATION (1-13, Hom-machi 4-chome Chuo-k, Osaka-shi Osaka, 541-0053, JP)
TAKENAKA ROAD CONSTRUCTION CO., LTD. (21-1, Ginza 8-chome Chuo-ku, Tokyo, 104-0061, JP)
TAKENAKA CIVIL ENGINEERING & CONSTRUCTION CO., LTD. (21-1, Ginza 8-chome Chuo-ku, Tokyo, 104-8234, JP)
Saito, Toshio c/o TAKENAKA Research & Development Institute (5-1 Otsuka 1-chom, Inzai-shi Chiba, 270-1352, JP)
Harakawa, Kenichi c/o TAKENAKA Research & Development Institute (5-1 Otsuka 1-chom, Inzai-shi Chiba, 270-1352, JP)
Wakinaka, Yoshitaka c/o TAKENAKA Research & Development Institute (5-1 Otsuka 1-chom, Inzai-shi Chiba, 270-1352, JP)
Kunishima, Takeshi c/o TAKENAKA ROAD CONSTRUCTION CO. LTD. (21-1, Ginza 8-chom, Chuo-ku Tokyo, 104-0061, JP)
Yoshimura, Kenichi c/o TAKENAKA ROAD CONSTRUCTION CO. LTD. (21-1, Ginza 8-chom, Chuo-ku Tokyo, 104-0061, JP)
Fujii, Yoshifumi c/o TAKENAKA CIVIL ENGINEERING & CONSTRUCTION CO. LTD. (21-1, Ginza 8-chom, Chuo-ku Tokyo, 104-8234, JP)
Andoh, Shin-ichiro c/o TAKENAKA CIVIL ENGINEERING & CONSTRUCTION CO. LTD. (21-1, Ginza 8-chom, Chuo-ku Tokyo, 104-8234, JP)
Iwata, Takeo (2-2-1-405, Tadao Machida-shi, Tokyo, 194-0035, JP)
Satou, Masakazu (1876-43, Honmachida Machida-shi, Tokyo, 194-0032, JP)
International Classes:
E01C7/00; E01C9/00; E01C11/16; H01Q17/00; (IPC1-7): E01C7/26; E01F9/00; H01Q17/00
Foreign References:
JPH11204985A
JPH05327267A
JPH10322080A
JP2000138491A
JPH04163998A
JP2001077586A
JPS63305597A
JPS6221103U
JPH041304A
JPS6436804A
FR1481906A
Other References:
See also references of EP 1431459A1
Attorney, Agent or Firm:
Nakajima, Jun (TAIYO, NAKAJIMA & KATO Seventh Floor, HK-Shinjuku Bldg., 3-17, Shinjuku 4-chom, Shinjuku-ku Tokyo, 160-0022, JP)
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