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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            <p>
              <s xml:id="echoid-s3391" xml:space="preserve">
                <pb o="61" file="0169" n="172" rhead="LIVRE II. DE LA MECANIQUE DES VOUTES."/>
              rence ſera 5 pieds 8 pouces 11 lignes, qui eſt l’épaiſſeur qu’il faut
                <lb/>
              donner aux piés-droits.</s>
              <s xml:id="echoid-s3392" xml:space="preserve"/>
            </p>
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          <div xml:id="echoid-div245" type="section" level="2" n="67">
            <head xml:id="echoid-head192" style="it" xml:space="preserve">Remarque.</head>
            <p>
              <s xml:id="echoid-s3393" xml:space="preserve">57. </s>
              <s xml:id="echoid-s3394" xml:space="preserve">Si l’extrados de la Voûte, au lieu d’être curviligne comme
                <lb/>
              nous le venons de ſupoſer, étoit terminé par deux plans 5. </s>
              <s xml:id="echoid-s3395" xml:space="preserve">4. </s>
              <s xml:id="echoid-s3396" xml:space="preserve">& </s>
              <s xml:id="echoid-s3397" xml:space="preserve">5. </s>
              <s xml:id="echoid-s3398" xml:space="preserve">6.
                <lb/>
              </s>
              <s xml:id="echoid-s3399" xml:space="preserve">il faudroit dans la ſeconde opération chercher la valeur du qua-
                <lb/>
              drilataire QF 5. </s>
              <s xml:id="echoid-s3400" xml:space="preserve">3. </s>
              <s xml:id="echoid-s3401" xml:space="preserve">(formé par l’angle F 5. </s>
              <s xml:id="echoid-s3402" xml:space="preserve">3. </s>
              <s xml:id="echoid-s3403" xml:space="preserve">& </s>
              <s xml:id="echoid-s3404" xml:space="preserve">les deux lignes QF
                <lb/>
              & </s>
              <s xml:id="echoid-s3405" xml:space="preserve">Q 3, qui ont été tirées des centres G & </s>
              <s xml:id="echoid-s3406" xml:space="preserve">H, pour diviſer les arcs
                <lb/>
              DB & </s>
              <s xml:id="echoid-s3407" xml:space="preserve">DI en deux également) en retrancher la figure mixtiligne
                <lb/>
              QCD2, & </s>
              <s xml:id="echoid-s3408" xml:space="preserve">diviſer le reſtant par la hauteur du pié-droit, le quotient
                <lb/>
              ſera le premier terme. </s>
              <s xml:id="echoid-s3409" xml:space="preserve">A l’égard des autres opérations, elles doivent
                <lb/>
              être de même que les précédentes.</s>
              <s xml:id="echoid-s3410" xml:space="preserve"/>
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            <head xml:id="echoid-head193" xml:space="preserve">PROPOSITION QUATRIE’ME.</head>
            <head xml:id="echoid-head194" xml:space="preserve">
              <emph style="sc">Proble’me</emph>
            .</head>
            <p style="it">
              <s xml:id="echoid-s3411" xml:space="preserve">Trouver l’épaiſſeur qu’il faut donner aux piés-droits qui
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              ſoûtiendroient une Plate-Bande.</s>
              <s xml:id="echoid-s3412" xml:space="preserve"/>
            </p>
            <p>
              <s xml:id="echoid-s3413" xml:space="preserve">58. </s>
              <s xml:id="echoid-s3414" xml:space="preserve">La Plate-Bande eſt une eſpece de Voûte qui a la figure d’un
                <lb/>
                <note position="right" xlink:label="note-0169-01" xlink:href="note-0169-01a" xml:space="preserve">
                  <emph style="sc">Planch</emph>
                  <lb/>
                6.</note>
              Plat-Fond; </s>
              <s xml:id="echoid-s3415" xml:space="preserve">ſon uſage le plus ordinaire eſt d’être employée dans les
                <lb/>
                <note position="right" xlink:label="note-0169-02" xlink:href="note-0169-02a" xml:space="preserve">
                  <emph style="sc">Fig</emph>
                . 2.</note>
              grands édifices, où il y a des periſtiles, comme au vieux Louvre à
                <lb/>
              Paris, ou bien on s’en ſert aux Portes-Cocheres; </s>
              <s xml:id="echoid-s3416" xml:space="preserve">& </s>
              <s xml:id="echoid-s3417" xml:space="preserve">alors comme
                <lb/>
              cette Voûte a beaucoup de pouſſée, on peut, pour la ſoulager du
                <lb/>
              poids qu’elle auroit à porter, faire un arc de décharge comme je
                <lb/>
              l’ai dit ailleurs. </s>
              <s xml:id="echoid-s3418" xml:space="preserve">Mr. </s>
              <s xml:id="echoid-s3419" xml:space="preserve">Abeille, Ingenieur du Canal de Picardie, a ima-
                <lb/>
              giné une conſtruction de plate-bande fort ingenieuſe; </s>
              <s xml:id="echoid-s3420" xml:space="preserve">la coupe des
                <lb/>
              Clavaux en eſt ſinguliere, & </s>
              <s xml:id="echoid-s3421" xml:space="preserve">contribuë beaucoup à diminuer la pouſ-
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              ſée queles piés-droits auroient à ſoûtenir: </s>
              <s xml:id="echoid-s3422" xml:space="preserve">j’en aurois volontiers fait
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              la deſcription, ſi elle étoit venuë à ma connoiſſance avant que les
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              Planches de ce ſecond Livre fuſſent gravées.</s>
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              <s xml:id="echoid-s3424" xml:space="preserve">Quand on veut conſtruire une plate-bande LDEF, on décrit ſur
                <lb/>
              la ligne LF qui en doit déterminer l’étenduë, un triangle équilateral
                <lb/>
              LAF, dont le point A ſert de centre pour trouver la coupe des Cla-
                <lb/>
              vaux, ainſi les lignes LD & </s>
              <s xml:id="echoid-s3425" xml:space="preserve">EF, (qui ne ſont autre choſe que les
                <lb/>
              côtés du triangle prolongé,) marquent les joints des deux derniers
                <lb/>
              Clavaux qui s’apuyent ſur les couſſinets, deſorte que c’eſt le Trapeze
                <lb/>
              LDEF, qui cauſe la pouſſée que les piés-droits ont à ſoûtenir: </s>
              <s xml:id="echoid-s3426" xml:space="preserve">or ſi
                <lb/>
              l’on ſupoſe la ligne LF de 24 pieds, l’épaiſſeur CK de 3, & </s>
              <s xml:id="echoid-s3427" xml:space="preserve">la hau- </s>
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