Le chiodature sono un intervento passivo di stabilizzazione di scarpate e fronti di scavo in cui si “rinforza” il terreno inserendo barre d’acciaio (i chiodi) dentro fori perforati e poi iniettati con boiacca di cemento, spesso abbinando in superficie un paramento (spritz-beton/calzestruzzo proiettato con rete e piastre di testa). Si definiscono passive perché i chiodi non vengono pretensionati: entrano in gioco quando il terreno tende a deformarsi, mobilitando l’aderenza barra–boiacca–terreno e creando un ammasso rinforzato che migliora la resistenza a scorrimento/ribaltamento e riduce le deformazioni, rendendo più stabile il pendio o lo scavo (tipicamente in sequenza dall’alto verso il basso, “a fasi”, durante l’avanzamento dei lavori).

### Barre a filettatura continua
Le barre a filettatura continua (fully threaded) sono impiegate come chiodi da roccia o soil nail, con posa in foro e fissaggio tramite resine o malta cementizia. La filettatura integrale consente l’utilizzo di dadi e manicotti in qualsiasi posizione, facilitando giunzioni, regolazioni e il montaggio di piastre di ripartizione e dispositivi di pretensionamento.

### Barre cave autoperforanti
Le barre cave autoperforanti (SDA) fungono contemporaneamente da asta di perforazione e da elemento resistente. Permettono perforazione e iniezione simultanee attraverso il foro centrale, riducendo il rischio di collasso del foro in terreni sciolti, coperture detritiche o rocce fratturate e migliorando la produttività in condizioni difficili.

**In accordo al D.M. n. 8 del 17/01/2018 "Norme tecniche per le costruzioni"**

<table>
  <thead>
    <tr>
      <th>B450C</th>
      <th>CODE</th>
      <th>LR20B</th>
      <th>LR25B</th>
      <th>LR28B</th>
      <th>LR32B</th>
      <th>LR40B</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Diametro nominale</td>
      <td>mm</td>
      <td>20</td>
      <td>25</td>
      <td>28</td>
      <td>32</td>
      <td>40</td>
    </tr>
    <tr>
      <td>Qualità</td>
      <td>N/mm²</td>
      <td colspan="5">450/540</td>
    </tr>
    <tr>
      <td>Carico di snervamento Min.</td>
      <td>kN</td>
      <td>141</td>
      <td>221</td>
      <td>277</td>
      <td>361</td>
      <td>565</td>
    </tr>
    <tr>
      <td>Carico a rottura Min.</td>
      <td>kN</td>
      <td>169</td>
      <td>265</td>
      <td>332</td>
      <td>434</td>
      <td>678</td>
    </tr>
    <tr>
      <td>Agt</td>
      <td>%</td>
      <td colspan="5">≥ 7,5%</td>
    </tr>
    <tr>
      <td>Sezione media</td>
      <td>mm²</td>
      <td>314</td>
      <td>490</td>
      <td>615</td>
      <td>803</td>
      <td>1255</td>
    </tr>
    <tr>
      <td>peso</td>
      <td>kg/m</td>
      <td>2,47</td>
      <td>3,85</td>
      <td>4,83</td>
      <td>6,31</td>
      <td>9,86</td>
    </tr>
    <tr>
      <td>Diametro min/max</td>
      <td>mm</td>
      <td>20/23</td>
      <td>25/29</td>
      <td>28/32</td>
      <td>32/36</td>
      <td>40/45</td>
    </tr>
  </tbody>
</table>

<br>

<table>
  <thead>
    <tr>
      <th>STD</th>
      <th>CODE</th>
      <th>LR20S</th>
      <th>LR25S</th>
      <th>LR28S</th>
      <th>LR32S</th>
      <th>LR40S</th>
      <th>LR50S</th>
      <th>LR57S</th>
      <th>LR63S</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Diametro nominale</td>
      <td>mm</td>
      <td>20</td>
      <td>25</td>
      <td>28</td>
      <td>32</td>
      <td>40</td>
      <td>50</td>
      <td>57,5</td>
      <td>63,5</td>
    </tr>
    <tr>
      <td>Qualità</td>
      <td>N/mm²</td>
      <td colspan="6">500/550</td>
      <td colspan="2">555/700</td>
    </tr>
    <tr>
      <td>Carico di snervamento Min.</td>
      <td>kN</td>
      <td>157</td>
      <td>245</td>
      <td>308</td>
      <td>402</td>
      <td>628</td>
      <td>982</td>
      <td>1441</td>
      <td>1758</td>
    </tr>
    <tr>
      <td>Carico a rottura Min.</td>
      <td>kN</td>
      <td>169</td>
      <td>265</td>
      <td>332</td>
      <td>434</td>
      <td>678</td>
      <td>1078</td>
      <td>1818</td>
      <td>2217</td>
    </tr>
    <tr>
      <td>Agt</td>
      <td>%</td>
      <td colspan="8">≥ 6%</td>
    </tr>
    <tr>
      <td>Sezione media</td>
      <td>mm²</td>
      <td>314</td>
      <td>490</td>
      <td>615</td>
      <td>803</td>
      <td>1255</td>
      <td>1963</td>
      <td>2596</td>
      <td>3167</td>
    </tr>
    <tr>
      <td>peso</td>
      <td>kg/m</td>
      <td>2,47</td>
      <td>3,85</td>
      <td>4,83</td>
      <td>6,31</td>
      <td>9,86</td>
      <td>15,41</td>
      <td>20,38</td>
      <td>24,86</td>
    </tr>
    <tr>
      <td>Diametro min/max</td>
      <td>mm</td>
      <td>20/23</td>
      <td>25/29</td>
      <td>28/32</td>
      <td>32/36</td>
      <td>40/45</td>
      <td>50/56</td>
      <td>57,5/63</td>
      <td>63,5/70</td>
    </tr>
  </tbody>
</table>

<br>

<table>
  <thead>
    <tr>
      <th>MID</th>
      <th>CODE</th>
      <th>LR20M</th>
      <th>LR25M</th>
      <th>LR28M</th>
      <th>LR32M</th>
      <th>LR40M</th>
      <th>LR50M</th>
      <th>LR57M</th>
      <th>LR63M</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Diametro nominale</td>
      <td>mm</td>
      <td>20</td>
      <td>25</td>
      <td>28</td>
      <td>32</td>
      <td>40</td>
      <td>50</td>
      <td>57,5</td>
      <td>63,5</td>
    </tr>
    <tr>
      <td>Qualità</td>
      <td>N/mm²</td>
      <td colspan="8">670/800</td>
    </tr>
    <tr>
      <td>Carico di snervamento Min.</td>
      <td>kN</td>
      <td>210</td>
      <td>328</td>
      <td>412</td>
      <td>538</td>
      <td>841</td>
      <td>1315</td>
      <td>1740</td>
      <td>2078</td>
    </tr>
    <tr>
      <td>Carico a rottura Min.</td>
      <td>kN</td>
      <td>251</td>
      <td>392</td>
      <td>492</td>
      <td>643</td>
      <td>1004</td>
      <td>1571</td>
      <td>2078</td>
      <td>2534</td>
    </tr>
    <tr>
      <td>Agt</td>
      <td>%</td>
      <td colspan="8">≥ 5%</td>
    </tr>
    <tr>
      <td>Sezione media</td>
      <td>mm²</td>
      <td>314</td>
      <td>490</td>
      <td>615</td>
      <td>803</td>
      <td>1255</td>
      <td>1963</td>
      <td>2596</td>
      <td>3167</td>
    </tr>
    <tr>
      <td>peso</td>
      <td>kg/m</td>
      <td>2,47</td>
      <td>3,85</td>
      <td>4,83</td>
      <td>6,31</td>
      <td>9,86</td>
      <td>15,41</td>
      <td>20,38</td>
      <td>24,86</td>
    </tr>
    <tr>
      <td>Diametro min/max</td>
      <td>mm</td>
      <td>20/23</td>
      <td>25/29</td>
      <td>28/32</td>
      <td>32/36</td>
      <td>40/45</td>
      <td>50/56</td>
      <td>57,5/63</td>
      <td>63,5/70</td>
    </tr>
  </tbody>
</table>

<br>




<table>
  <thead>
    <tr>
      <th>PLUS+</th>
      <th>CODE</th>
      <th>LR20P</th>
      <th>LR25P</th>
      <th>LR28P</th>
      <th>LR32P</th>
      <th>LR40P</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Diametro nominale</td>
      <td>mm</td>
      <td>20</td>
      <td>25</td>
      <td>28</td>
      <td>32</td>
      <td>40</td>
    </tr>
    <tr>
      <td>Qualità</td>
      <td>N/mm²</td>
      <td colspan="5">900/1100</td>
    </tr>
    <tr>
      <td>Carico di snervamento Min.</td>
      <td>kN</td>
      <td>282</td>
      <td>441</td>
      <td>553</td>
      <td>723</td>
      <td>1129</td>
    </tr>
    <tr>
      <td>Carico a rottura Min.</td>
      <td>kN</td>
      <td>345</td>
      <td>539</td>
      <td>676</td>
      <td>883</td>
      <td>1380</td>
    </tr>
    <tr>
      <td>Agt</td>
      <td>%</td>
      <td colspan="5">≥ 3,5%</td>
    </tr>
    <tr>
      <td>Sezione media</td>
      <td>mm²</td>
      <td>314</td>
      <td>490</td>
      <td>615</td>
      <td>803</td>
      <td>1255</td>
    </tr>
    <tr>
      <td>peso</td>
      <td>kg/m</td>
      <td>2,47</td>
      <td>3,85</td>
      <td>4,83</td>
      <td>6,31</td>
      <td>9,86</td>
    </tr>
    <tr>
      <td>Diametro min/max</td>
      <td>mm</td>
      <td>20/23</td>
      <td>25/29</td>
      <td>28/32</td>
      <td>32/36</td>
      <td>40/45</td>
    </tr>
  </tbody>
</table>

<br>