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Está en la página 1de Buscar dentro del documento Dr. Horie: scris 1A 70 X ; Coli ipar: Avem de-a face marc schaefer elvetia anti imbatranire 0 dezvoltare dictatd nu de necesitatea suplinini unor lipsuri, cl ca urmare a Capacitéfi societal de a investi in inteligenta, In cercetarea fundamentala, pentru ca apoi roadele sa fie culese in sfera economica propriv-zisa.

Un merit deosebit ba avut industria noastra textili, care In acea epoct de economie autarhicd, a produs 0 gama Corespunzétoare de geotextle, asigurand astie! Sciiderea dramaticé a investitilor, reducerea practict a iueréiilor din domeniu! Poate fi evident utie! Prezentarea autorilor Geosinteticele in constructil, iucrare elaborati de dr.

Lia Kellner, prot. Adrian Gazdaru si ing. Autorii fac parte dintre inginerit roméni care au fost preocupati, ncepand din deceniul sapte, de promovarea geotextilelor in lucrarle de construct ce se realizau pe atunci n tara si in straindtate. Lia Kellner a lucrat in utimit doudizeci de ani ca cercetztor In cadrul Institutului de Cercetiri Hidrotehnice, efectuand Incercéiri asupra geotextilelor autohtone ce Incepuserd a fi produse atunci in fara.

Este autoarea primului normativ romanesc privind aceste produse.

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Adrian Gazdaru a lucrat in pericada ca inginer de conceptie In unitafi de constructi, folosind cu succes geotextible Intr-0 serie de amenajrihidrotehnice. La aceste lucréri au fost utilizate mari cantitati de geotextile romanesti. Dupa s-a interesat permanent de lérgirea domenillor de utilzare a geosinteticelor In Roménia.

Presentation of the authors Geosynthetics in Construction Works was elaborated by Mrs. Lia Kelner, Ph. Eng, Prot.

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Adrian Gazdaru, Ph. Eng, and Eng. Valentin Feodorov. Consequently, the work is addressed as much to the specialists as to the decision-makers, moreover, to all the constructors interested in an increase of efficiency and a reduction of the costs of their works. After he constantly encouraged and supported the increase of the geosynthetics utiization domain in Romania. Présentation des auteurs Les géosynthétiques dans les constructions, ouvrage élaboré par le dr.

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Elle est Fauteur du premier standard roumain concemant ces produits. Aprés i! Tests and their results, which characterize each and every geosynthetic material, provide the essential elements that manufacturers use when Gealing with users, therefore the chapter includes a definition of identification trials and performance tests, as well as their classification. Geotexties, geomembranes, geonets are detailed next, mentioning the progress of their production, their main properties, the present level of utilization worldwide.

It is estimated that, as regards geotextiles, their manufacture and use in Romania compared to the international suavion was marc schaefer elvetia anti imbatranire behind in botox riduri de expresie only years.

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A review of the geotextiles produced vl and used in our country in that period is also provided. Chapter 1 is accompanied by seven tables where information about polymers and geosynthetics is presented. The following materials are considered: non-woven gectextlos; woven geotextles; knited gootextles; special ectextiles; compound gectextiles.

The figures ie appear fhose matords, white te table included in this chapter presents the relationship between the manufacturing technologies and several essential characteristics of gectextiles.

Roman, V. Mai exista vreo solutie, sau va dispare tara, cum au pierit multe in trecut.

CHAPTERS Geotextile characteristics This chapter starts with a discussion about the most appropriate Romanian word that would doscrbe the fecures Sisplayed by gecterties comes property and characteristics, the latter was chosen as being the Next, a definition of the characteristics of geotextiles, as well as test methods and installations and their implication in the performance of the materials after construction are described. The last type is analyzed more closely, based on information from the existing technical literature, since these characteristics attract the special attention of users and constitute the most criticized aspect marc schaefer elvetia anti imbatranire the geosynthetics applications in construction works.

Thirty-four groups of products are given, mentioning the rmanufacturer, country, some important characterises, structure and area e. Ten groups of possible uses are examined where geotextiles apply, especially in earthworks, but also in others that are listed in the contents. For each use, a short analysis of the functional strength and stability features for the respective group of applications is provided, alongside with a definition of the location or units where geotextiles may be inserted.

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Wherever appropriate, the use of geotextiles was compared with that of traditional materials. Characteristics and the levels necesary for the geotextile to display are presented in this chapter too.

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The solutions are detailed for each group, with examples of case-studies achieved, ilustrated by sixty figures. This chapter constitutes a practical, work guide for the elaboration and design of construction works using geotextiles.

Feudalismul Actual Moldo Valah : 104 : Sistem Mafiot

Choosing the appropriate geotextile. Installation of geotextiles. The choice of an appropriate geotextile to be used in a particular case is considered in the pamela smith anti aging of the functional and circumstancial stresses it will have to beer. A review of the necessary stages before reaching a decision is provided, while grouping the product characteristics considering the function they have to fulfil.

As for the design, the second volume of this work will provide calculations regarding the stresses and loads that geotextiles are required to be different works, as well as the level of their necessary characteristics.

A number of photos show the moments of a proper installation. In the second volume, which the authors hope to be able to publish inthe economic and financial aspects of geotextiles will be discussed, i. Prices, efficiency, a comparison of the costs for traditional solutions and those using geotextiles, starting from the idea that the market, very Unstable now due to the current inflation and influences specific to the transition to a free economy, will have been stabilized by then.

On passe en revue briévement la Chimie des polymeres, afin de souligner les marc schaefer marc schaefer elvetia anti imbatranire anti imbatranire des matériaux de base dont les géosynthétiques sont fabriques.

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Le premier chapite, est accompagn par sept tableaux synthétiques sur les polymares les géosynthetiques. On étudie en cette perspective: géotextiles Non-tissées; géotextiles tissées; géotextiles tricot; géotextiles spéciales; géotextiles composées. Les dessins présentés offrent une image de ces types de produits.

Un tableau résume les relations entre les technologies: de fabrication et les caractéristiques definitolres des géotextiles. En ce qui suit on présente les caractéristiques des géotextiles, leur définiion, les méthodes et les instruments de détérmination, la relation entre ces données et le fagon dont les matériaux vont accomplir leurs fonctions dans les constructions. Les fonctions sont mises en relation avec les caractéristiques des produits, en accentuant idee que par leur nature méme, les géotextiles communement utiisés accomplissent plusieurs fonctions, Une large place est faite aux fonctions essentielles ftrantes- drainantes.

Les fonctions sont groupées en: 1 fonctions principales fitrante; drainante; de separation; de protection; de renforcement et 2 fonctions derives anti-¢rosion; support; contenance; glissement.

Quelques criteres significatifs pour la fonction de protection et celle fitrante drainante marc schaefer elvetia anti imbatranire présentés dans deux tableaux. Les Produits fabriqués de par le monde sont classés en géotextiles Classiques, spéciaux et composés.

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On présente trente-quatre groupes de produits, par fabriquant et par pays, avec quelques caractéristiques de base, leur structure et leurs domaines d'utilisation. Dix groupes de domaines d'application des géotextiles sont abordés, principalement dans les travaux de terrassements, mais également autres domaines. Pour chaque groupe on analyse briévement le spécifique fonctionnel, de resistence et de stabilite des constructions concemées, en définissant la place ou les éléments ois Fon peut introduire les géctextiles.

Partout oi t'on a jugé utile, on a établi une comparaison avec les solutions utlisant des matériaux classiques. Les charactéristiques des géotextiles sont revues ensuite, par rapport au niveau Quelles doivent atteindre.

Ce chapitre représente un instrument practique, de travail, pour lélaboration des projets de construction avec des géotextiles.

LLinstallation des géotextiles comme principale phase téchnologique est étudi¢e {étermination de la forme et des dimensions de la surface Ginstallation, sa préparation, installation proprement dite, les jonctions entre les couches de matériel, la protection des travaux.

Les opérations sont décrites briévement, avec les aspects les plus importants, en signalant les facteurs qui pourraient détériorer le géotextile pendant cette phase essentielle pour son comportement de longue durée.

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De ce geosintetice? Geosinteticele se constituie tn prezent In urmatoarele grupe mari: ~ Geotextilele, care au ca functii principale filtrarea si drenarea; ~ Geomembranele, marc schaefer elvetia anti imbatranire asiguré o etangare foarte avansata; ~ Geogrilele si georetele, pentru rantorsare armare, consolidare ; ~ Geocompozitele, combinafii de materiale din primele trei grupe, sau cu alte Produse, realizate In special in deceniul opt.

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Geosinteticele pot rezolva tn structurile din pamant, in deosebi In cele care In mod inerent sunt in contact cu apa din exteriorul sau din interiorul lor - apa din Porii pamantului - dezideratul major iginerului:! Urme despre stabilizarea terenulyi de fundatie peatru drumuri, utiizand Jemnul, exist tn Angiia de acum 5 de ani.

Prospecte foarte atrégétoare, mostre convingatoare si in special liste cu referinte de lucrari extrem de diverse, care au fost executate circula in lumea celor interesati. In acest context, este momentul sa trecem in revist avantajele pe care le prezinta geosinteticeie: a. Inlocuiesc volume gi mase mari de materiale clasice: filtre inverse minerale, pereuri din beton si masti din asfalt, reduc gabaritele terasamentelor, 1n final conduc la 0 mare economie de resurse materiale naturale, precum gi de 4 energie pentru marc schaefer elvetia anti imbatranire, prelucrare, transport gi punere In opera.

Geotextilele gi geomembranele au o elasticitate importants, calitate foarte necesara In structnle din pamant ce pot avea, In exploatare, deforma Insemnate, pe care le preiau deci usor.

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Rezistenta lor la intindere se pastreaza chiar la alungiri nsemnate. Se pot testa cu usurinfa tn prealabil, reproducandu-se conditile de lucru, tunele dintre geosintetice avand incorporate elemente ce permit verificarea Parametrilor chiar in perioada de exploatare. O tehnologie corect conceputa gi aplicaté poate elimina acest dezavantaj - Sunt sensibile la radiatile ultraviolete, desi de obicei nu sunt supuse direct acflunii lor, raze care pot rupe anumite lantur! De altfel este de femarcat 0 anume duplictate In atitudinea fafa de polimeri, ca deseuri poluante: buteli,foli, ambalaje etc.

O pondere Insemnati 0 au materialele clasice gi transporturile care Inglobeazd mutta energie. Utiizarea geosinteticelor, reducand transporturile de la distanja, cu volume mari, ar diminua considerabil consumul de carburanti si deci costurile la acest capitol unde cresterile de pret sunt de aproape de ori.

Pe de altd parte, ar scidea gi presiunea asupra materialelor energofage: ciment gi bitum pentra etanséri.

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