Bélidor, Bernard Forest de, La science des ingenieurs dans la conduite des travaux de fortification et d' architecture civile

Table of Notes

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              <s xml:id="echoid-s4687" xml:space="preserve">
                <pb o="45" file="0223" n="229" rhead="LIVRE III. DE LA CONSTRUCTION DES TRAVAUX."/>
              obligé de faire les foſſés fort larges, parce qu’en les aprofondiſſant,
                <lb/>
              on aura toûjours des terres ſufiſamment, & </s>
              <s xml:id="echoid-s4688" xml:space="preserve">les ouvrages en ſeront
                <lb/>
              de meilleure défenſe, à cauſe qu’ils ſeront moins decouverts: </s>
              <s xml:id="echoid-s4689" xml:space="preserve">ſi au
                <lb/>
              contraire le terrain eſt aquatique, & </s>
              <s xml:id="echoid-s4690" xml:space="preserve">qu’on ne puiſſe s’enfoncer
                <lb/>
              auſſi avant qu’on le voudroit, ſans être incommodé des eaux; </s>
              <s xml:id="echoid-s4691" xml:space="preserve">alors
                <lb/>
              on prend ſur la largeur, ce que l’on ne peut tirer de la profondeur;
                <lb/>
              </s>
              <s xml:id="echoid-s4692" xml:space="preserve">mais, je le repete, toutes ces conſiderations doivent dépendre du
                <lb/>
              projet, ainſi dans l’éxecution il ne s’agit que de bien diriger les atte-
                <lb/>
              liers. </s>
              <s xml:id="echoid-s4693" xml:space="preserve">Cet article demande beaucoup de circonſpection, & </s>
              <s xml:id="echoid-s4694" xml:space="preserve">quoique la
                <lb/>
              choſe ne paroiſſe qu’une bagatelle, je crois qu’on conviendra qu’on
                <lb/>
              n’a guere executé de grands travaux, ſans qu’il ne ſoit arrivé quelque
                <lb/>
              mal entendu dans le maniment des terres; </s>
              <s xml:id="echoid-s4695" xml:space="preserve">ici, faute d’en avoir fait
                <lb/>
              un amas aſſez conſiderable, avant d’élever les revêtemens, on eſt
                <lb/>
              obligé, pour achever l’ouvrage, d’en raporter par de longs circuits
                <lb/>
              qui augmentent les relais, par conſequent la depenſe; </s>
              <s xml:id="echoid-s4696" xml:space="preserve">là, pour n’y
                <lb/>
              avoir pas fait aſſés d’attention, il s’en trouve une trop grande quanti-
                <lb/>
              té, qu’il faut dans la ſuite tranſporter ailleurs, peut-être même auprès
                <lb/>
              de l’endroit d’où on les avoit tirées, deſorte qu’une toiſe cube,
                <lb/>
              qui n’auroit dû être maniée que deux fois, l’une pour la tranſpor-
                <lb/>
              ter, l’autre pour la mettre en œuvre, a été promenée à differens
                <lb/>
              endroits inutilement, ce qui en double ou triple la valeur; </s>
              <s xml:id="echoid-s4697" xml:space="preserve">au reſte
                <lb/>
              je ſai bien que cela n’arrive point à ceux qui ont une grande con-
                <lb/>
              noiſſance des travaux, parce qu’ils ſavent prevoir, dés le commen-
                <lb/>
              cement de l’ouvrage, les ſuites des moindres choſes.</s>
              <s xml:id="echoid-s4698" xml:space="preserve"/>
            </p>
            <p>
              <s xml:id="echoid-s4699" xml:space="preserve">Pour faire voir de quelle maniere on peut eſtimer aſſez juſte
                <lb/>
                <note position="right" xlink:label="note-0223-01" xlink:href="note-0223-01a" xml:space="preserve">
                  <emph style="sc">Planch</emph>
                .
                  <lb/>
                7.</note>
              la quantité de terre deſtinée à la conſtruction d’un ouvrage, nous
                <lb/>
              ſupoſerons qu’on a tracé ſur un terrain bien uni, & </s>
              <s xml:id="echoid-s4700" xml:space="preserve">dans lequel on
                <lb/>
              peut aprofondir à ſec, un front de Poligone ABCDEF, dont
                <lb/>
              le foſſé eſt terminé par la Contreſcarpe GHI, & </s>
              <s xml:id="echoid-s4701" xml:space="preserve">que le rempart
                <lb/>
              qu’on veut élever eſt exprimé par le profil ABDKMX: </s>
              <s xml:id="echoid-s4702" xml:space="preserve">cela
                <lb/>
              poſé, comme la terre qu’on doit porter du côté de la place, & </s>
              <s xml:id="echoid-s4703" xml:space="preserve">
                <lb/>
              qu’on voit exprimé ici par KKK, &</s>
              <s xml:id="echoid-s4704" xml:space="preserve">c. </s>
              <s xml:id="echoid-s4705" xml:space="preserve">depend de l’élevation du
                <lb/>
              rempart; </s>
              <s xml:id="echoid-s4706" xml:space="preserve">nous ferons comme ſi le revêtement devoit avoir 30. </s>
              <s xml:id="echoid-s4707" xml:space="preserve">pieds
                <lb/>
              de hauteur, depuis le fonds du foſſé juſqu’au cordon, & </s>
              <s xml:id="echoid-s4708" xml:space="preserve">le foſſé
                <lb/>
              18. </s>
              <s xml:id="echoid-s4709" xml:space="preserve">pieds de profondeur; </s>
              <s xml:id="echoid-s4710" xml:space="preserve">en ce cas, pour que toutes les parties
                <lb/>
              du profil ſoient bien proportionnées, il faut que la hauteur BC,
                <lb/>
              du rempart, du côté de la place, ſoit de 12. </s>
              <s xml:id="echoid-s4711" xml:space="preserve">pieds & </s>
              <s xml:id="echoid-s4712" xml:space="preserve">demi, la
                <lb/>
              rampe AC, de 19. </s>
              <s xml:id="echoid-s4713" xml:space="preserve">& </s>
              <s xml:id="echoid-s4714" xml:space="preserve">demi, la largeur CE, de 30. </s>
              <s xml:id="echoid-s4715" xml:space="preserve">la hauteur
                <lb/>
              ED, de 14. </s>
              <s xml:id="echoid-s4716" xml:space="preserve">la rampe EG, de la banquette de 3. </s>
              <s xml:id="echoid-s4717" xml:space="preserve">ſa largeur GL,
                <lb/>
              de 4. </s>
              <s xml:id="echoid-s4718" xml:space="preserve">& </s>
              <s xml:id="echoid-s4719" xml:space="preserve">demi, & </s>
              <s xml:id="echoid-s4720" xml:space="preserve">la hauteur FG, ou HL, de 15. </s>
              <s xml:id="echoid-s4721" xml:space="preserve">& </s>
              <s xml:id="echoid-s4722" xml:space="preserve">demi, enfin le
                <lb/>
              parapet devant avoir 4. </s>
              <s xml:id="echoid-s4723" xml:space="preserve">pieds & </s>
              <s xml:id="echoid-s4724" xml:space="preserve">demi de hauteur, KN, ſera de </s>
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