METHOD OF HYDRAULIC ENGINEERING WORKS - Application Publication Kokoku 59-37,356 - Patent Specification

Sep 21, 2026

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Patent publication for a method of hydraulic engineering works using an earth-protecting mixture combined with drift material and water-filtering material, together with a web of needle-punched nonwoven fabric. The fabric has an apparent specific gravity below 0.2 and a main component of polypropylene-type fibers, with a defined product of monofilament strength and elongation at rupture exceeding 100. The disclosure addresses shortcomings of conventional resin-bonded textile or nonwoven materials and motivates improved durability, water-penetration, strength stability over time, and resistance in construction environments.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages16

Reading Time40 min

AccessFree to download

Claims

Detailed Description of the Invention

Specification (Invention Summary)

Definitions and Material Properties

Tomioka,T.,and Matsumoto,T. iMethod of hydraulic engineering works.6 p. Patent(Japanese)No.59-37366(1984)。Filed: TRANSLATION NO.4549 T R AN SL A TI旦NPATENT BUREAU OF JAPANOFFICIAL GAZETTE FOR EXAMINED PATENTS Japanese Patent Application Publication Kokoku No.59-37,356Publication Date:September 10,1984 (Total of 4 pages) Number of Inventions:1 InternationaI CIasSE02 B 3/04Intraburea5-2os.D04H 1/467199-4LE02D3/006963-2D METHOD OF HYDRAULIC ENGINEERING WORKS Application No.46-80,057 Application Date:October 11,1971 Disclosure Number:48-44,574 Disclosure Date:June 26,1973 Inventors:Taka Tomioka 710 Yoshimi-machi,MoriyamaTadao Matsumoto710 Yoshimi-machi,Moriyama Applicant:Chisso Inc.,Ltd.3-6-32 Nakanoshima,Kita-ku,Osaka Patent Attorney:Yataro Sasai References Cited by the Examiner: Patent Publication Kokoku No.48-14,114 (JP,B1) Selling of Construction Fiber Materials, NewspaperIssue of Nippon Sen'i Co.,August 28,1971 Handbook on Fiber Treatment, Compiled by the Societyof Fiber Engineers, 1970,pp.1182-1183,MarubeniPublishers Nonwoven Materials, 1967,No.43,p.83.Issue ofNikkanKogyo Shimbun Co. SPECIFICATION 1.Claims: A method of hydraulic engineering works,characterized byutilizing an earth-protecting mixture,drift material and water-filtering material in cozibination with a web of a needle-punchednonwoven fabric with an apparent specific gravity below 0.2 andhaving as its main component polypropylene-type fibers with theproduct of the monofilament strenqth(q/d)ana elongation atrupture (8)above 100. Detailed Description of the Invention Since Japan is a mauntainous country and has a very longcoast line and a large population,land protection anddevelopment works assume an important role in the economy,andriparian works,water-control operations and road-building areunaer constant development. In all these construction works,processes connected with water control (hereinafter referred toas hydraulic engineering works)are of a great importance.Undersuch circumstances,it is a matter of vital necessity to providefor such construction materials for hydraulic engineering worksas a mixture of earth and sand drift,water filtering material,suction protection agents and stones,etc.,which possess a hightensile strength,sufficient flexibility with high toughness,resistivity to the action of sea water and fire,resistance toclogging by sand,high water-penetration capacity,and highdurability. Nowadays synthetic fibers are used relatively successfullyas a construction material in the above-mentioned field.In thiscase a textile fabric and a nonwoven material with fibers bondedby a resin are utilized. However,the former material isunsatisfactory from the standpoint of tensile strength,elasticity andreduction of water penetration because ofclogging,whereas the latter,although possessing an improvedwater penetrability,undergoes changes in properties over time,resulting in a reduction of strength and particularly_of tensilestrength. Therefore,further improvement in the performance ofsuch materials is required under conditions of the constantly-developing construction works. On the basis of studies conducted over many years,theauthors of the present invention have shown that polypropylene-type fibers demonstrate properties most suitable for theapplication under consideration. The authors have also studiedtreatment processes capable of still further improving theproperties of this material and have come to the presentinvention,which suggests a nonwover fabric as being mostsuitable for construction applications at the present stage. The present invention relates to a method of hydraulicengineering works,characterized by utilizing an earth-protectingmixture,drift material and water-filtering material incombination with a web of a needle-punched nonwoven fabric withan apparent specific gravity below 0.2 and having as its fnaincomponent polypropylene-type fibers with the product of themonofilam

FAQs

What materials and structures are used in the disclosed hydraulic engineering method?

The method uses an earth-protecting mixture with drift material and water-filtering material, combined with a web of needle-punched nonwoven fabric.

What key property targets are defined for the nonwoven fabric?

The fabric must have an apparent specific gravity below 0.2 and use polypropylene-type fibers where the product of monofilament strength and elongation at rupture exceeds 100.

Why does the disclosure emphasize polypropylene-type fibers?

Polypropylene-type fibers are described as having high tensile strength, stability against worms and fungi, resistance to earth-related acid/alkali effects, and long-term property retention.

Sep 21, 2026

Uploaded by Jiven